bootstrapping the data envelopment analysis malmquist productivity index this paper presents a bootstrap approach to calculate confidence intervals for firm specific malmquist productivity indices obtained from data envelopment analysis dea models the bootstrap is easily implemented and allows identification of production units that have significant productivity changes an application using data from swedish eye care departments is included we find that 40 of departments have significant progress in productivity whereas only 10 of the departments have a significant regress in productivity this differs from the original results where about half the sample have estimates of progress and the other half have estimates of regress in productivity

a fresh look at the productivity and efficiency changes of uk airlines this article uses the bootstrapped malmquist index methodology to measure and test the extent of efficiency and productivity changes in the uk airline sector the aim of the bootstrap method is to overcome the statistical limitations of the data envelopment analysis dea method generally used to measure the distance functions of the malmquist index in applying the method we use input output data on a sample of major uk airlines for the period 2004 2007 results showed that most airlines have witnessed significant decrease in their productivity efficiency scale and technology measures using a second stage tobit regression this article attributed the sources of productivity and efficiency changes to factors such as stage length load factor and airline size this article also discussed the negative impacts of oil price using illustrations from the uk and other international airlines

polarized business cycles abstract four stylized facts motivate this paper i business cycle movements are wider in emerging countries ec than in developed ones ii ec experience greater economic policy uncertainty iii ec are more polarized and less politically stable and iv epu is positively related to political polarization a standard real business cycle model augmented to incorporate political polarization a polarized business cycle pbc model is shown to be consistent with these facts we first derive our results analytically and then quantify the effects of a permanent increase in polarization to the us economy

some models for estimating technical and scale inefficiencies in data envelopment analysis in management contexts mathematical programming is usually used to evaluate a collection of possible alternative courses of action en route to selecting one which is best in this capacity mathematical programming serves as a planning aid to management data envelopment analysis reverses this role and employs mathematical programming to obtain ex post facto evaluations of the relative efficiency of management accomplishments however they may have been planned or executed mathematical programming is thereby extended for use as a tool for control and evaluation of past accomplishments as well as a tool to aid in planning future activities the ccr ratio form introduced by charnes cooper and rhodes as part of their data envelopment analysis approach comprehends both technical and scale inefficiencies via the optimal value of the ratio form as obtained directly from the data without requiring a priori specification of weights and or explicit delineation of assumed functional forms of relations between inputs and outputs a separation into technical and scale efficiencies is accomplished by the methods developed in this paper without altering the latter conditions for use of dea directly on observational data technical inefficiencies are identified with failures to achieve best possible output levels and or usage of excessive amounts of inputs methods for identifying and correcting the magnitudes of these inefficiencies as supplied in prior work are illustrated in the present paper a new separate variable is introduced which makes it possible to determine whether operations were conducted in regions of increasing constant or decreasing returns to scale in multiple input and multiple output situations the results are discussed and related not only to classical single output economics but also to more modern versions of economics which are identified with contestable market theories

long run prices of primary commodities and oil prices acutely volatile movements in primary commodity prices have drawn considerable interest from empirical researchers exports of these commodities account for the bulk of export earnings of developing countries the traditional demand based framework was unable to explain the marked deterioration in these prices during the 1980s this paper tries to ascertain the role played by real oil prices in explaining the extremely volatile movements in real prices of primary commodities by taking into account oil price shocks over the period 1973 1996 using monthly data real primary commodity prices and real oil prices are cointegrated additionally the error in the cointegrating relation stimulates real commodity price adjustment not real oil price adjustment

partisan conflict and private investment abstract american politics have been characterized by a high degree of partisan conflict in recent years combined with a divided government this has led not only to significant congressional gridlock but also to spells of high fiscal policy uncertainty the unusually slow recovery from the great recession during the same period suggests the possibility that the two phenomena may be related in this paper i investigate the hypothesis that political discord depresses private investment to this end i construct a novel high frequency indicator of partisan conflict the partisan conflict index pci uses a semantic search methodology to measure the frequency of newspaper articles reporting lawmakers disagreement about policy i find a negative relationship between the pci and aggregate investment in the us moreover the decline is persistent which may help explain the slow recovery observed since the 2007 recession ended partisan conflict is also associated with lower capital investment rates at the firm level even when economic policy uncertainty and macroeconomic conditions are controlled for i estimate that about 27 of the decline in corporate investment between 2007 2009 can be attributed to a rise in partisan conflict

bias and precision in the dea two stage method in data envelopment analysis dea the two stage method is a popular procedure for accounting for exogenous influences on efficiency with the conventional two stage method a dea is first conducted using only traditional endogenous inputs and outputs then the first stage dea scores are regressed on the environmental contextual exogenous inputs of interest the regression outcomes are used to identify exogenous inputs that influence the first stage dea scores to a statistically significant degree and to adjust dea scores to account for these influences herein it is demonstrated empirically that the conventional method exhibits substantial bias and low precision with the degree of bias and precision affected by input variance and correlation a reverse two stage procedure that yields estimates without the bias and precision problems that compromise the validity of the conventional method s estimates is suggested

economic growth and energy consumption causal nexus viewed through a bootstrap rolling window one puzzling results in the literature on energy consumption economic growth causality is the variability of results particularly across sample periods sample sizes and model specification in order overcome these issues this paper analyzes the causal links between energy consumption and economic growth for g 7 countries using bootstrap granger non causality tests with fixed size rolling subsamples the data used includes annual total energy consumption and real gross domestic product gdp series from 1960 to 2006 for g 7 countries excluding germany for which the sample period starts from 1971 using the full sample bootstrap granger causality test we find that there is predictive power from energy consumption to economic growth only for canada however parameter instability tests show that none of the estimated models have constant parameters and hence the full sample results are not reliable analogous to the full sample results the results obtained from the bootstrap rolling window estimation indicate no consistent causal links between energy consumption and economic growth we however find that causal links are present between the series in various subsamples furthermore these subsample periods correspond to significant economic events indicating that the findings are not statistical artefacts but correspond to real economic changes our results encompass previous findings and offer an explanation to varying findings

trade policy reform and performance in manufacturing mexico 1975 88 1 this article examines the impact of the major trade liberalisation that has been introduced in mexico since the mid 1980s on efficiency in the manufacturing sector alternative indicators of efficiency are estimated and changes in these indicators are explained by regression analysis including various measures of the degree of liberalisation the conclusion is that thus far liberalisation has had a positive but relatively weak effect on performance

permanent and temporary inflation uncertainty and investment in the united states abstract we estimate the impact on us non residential fixed investment of permanent and temporary inflation uncertainty we find that while both have a negative effect temporary uncertainty is more important for investment this study has implications for monetary policy and applied econometric practice

using panel data analysis to estimate confidence intervals for the dea efficiency of individual decision making units this article demonstrates a methodology using panel data analysis to estimate confidence intervals for the data envelopment analysis efficiency of individual decision making units dmus and the statistical significance of trends in individual dmu efficiency the procedure accounts for stochastic variations of the inputs and outputs of the target dmu as well as stochastic variations of the inputs and outputs of its efficient benchmark peers the procedure is demonstrated using 9 years of data from 34 canadian paratransit agencies

time varying effect of oil market shocks on the stock market abstract a mixture innovation time varying parameter var model is used to examine the impact of structural oil price shocks on u s stock market return time variation is evident in both the coefficients and the variance covariance matrix the standard deviations of the demand side structural shocks reached forty year peaks during the global financial crisis and have remained high since in the real stock return equation the coefficient of global real economic activity has declined since the late 1990s and that of oil market specific demand oil shock has been lower since the early 1990s than before the structural oil shocks account for 25 7 of the long run variation in real stock returns overall with substantial change in levels and sources of contribution over time the contribution of shocks to global real economic activity to real stock return variation rose sharply to 22 in 2009 and remains 17 over 2009 2012 the contribution of oil market specific demand price shocks rose unevenly from 5 in the mid 1970s to about 15 in 2007 with a subsequent decline the contribution of oil supply shocks has trended downward from 17 to 5 over 1973 2012

efficiency analysis of german electricity distribution utilities non parametric and parametric tests this study applies non parametric and parametric tests to assess the efficiency of electricity distribution companies in germany traditional issues in electricity sector benchmarking are addressed such as the role of scale effects and optimal utility size as well as new evidence specific to the situation in germany labour capital and peak load capacity are used as inputs and units sold and the number of customers as output the data cover 307 out of 553 german electricity distribution utilities a data envelopment analysis dea is applied with constant returns to scale crs as the main productivity analysis technique whereas stochastic frontier analysis sfa with distance function is the verification method the results suggest that returns to scale play but a minor role only very small utilities have a significant cost advantage low customer density is found to affect the efficiency score significantly in particular in the lower third of all observations surprisingly east german utiliti

multinationals and market structure in mexico abstract this paper examines how foreign direct investment influences market concentration in mexican manufacturing industries the results suggest that mnc presence has a positive influence on concentration independently of the industrial variables which are commonly thought to determine it several tentative explanations including the mncs market conduct are offered although no definite conclusions can be drawn other variables that are found to be significant indetermining market concentration are market size economies of scale capital intensity and advertising intensity

impacts of random noise and specification on estimates of capacity derived from data envelopment analysis abstract data envelopment analysis dea is widely used to estimate the efficiency of firms and has also been proposed as a tool to measure technical capacity and capacity utilization cu random variation in output data can lead to downward bias in dea estimates of efficiency and consequently upward bias in estimates of technical capacity this can be particularly problematic for industries such as agriculture aquaculture and fisheries where the production process is inherently stochastic due to environmental influences this research uses monte carlo simulations to investigate possible biases in dea estimates of technically efficient output and capacity output attributable to noisy data and investigates the impact of using a model specification that allows for variable returns to scale vrs we demonstrate a simple method of reducing noise induced bias when panel data is available we find that dea capacity estimates are highly sensitive to noise and model specification analogous conclusions can be drawn regarding dea estimates of average efficiency

wage and competition channels of foreign direct investment and new firm entry using a rich data set of the dutch manufacturing sector between 1995 and 2010 we investigate the effect of foreign direct investment fdi on domestic new firm entry the emerging empirical literature has focused on the direct relationship between fdi and entry but has not explored the mechanisms behind the observed effect drawing on a simultaneous equations model our analysis features both the direct effect of fdi as well as indirect effects through two channels industry competition and wages we estimate the parameters through 3sls and take into account the endogeneity of competition and wages with respect to entry our results show that there is a significant negative direct effect of fdi on entry at the same time fdi decreases competition and increases wage levels which then impact entry positively and negatively respectively the total effect of fdi is negative but small and virtually disappears after one year policy implications are discussed

oil price fluctuations and u s dollar exchange rates adding oil prices to the monetary model of exchange rates we find that oil prices significantly explain movements in the value of the u s dollar usd against major currencies from the 1970s to 2008 our long run and forecasting results are remarkably consistent with an oil exchange rate relationship increases in real oil prices lead to a significant depreciation of the usd against net oil exporter currencies such as canada mexico and russia on the other hand the currencies of oil importers such as japan depreciate relative to the usd when the real oil price goes up

the economic effects of foreign bank presence evidence from the philippines abstract this study examines the economic effects of the liberalization of foreign bank entry in the philippines from 1990 to 2006 the findings provide strong evidence on the dominance of competition effects from foreign bank presence which lead to the reduction in the profitability and overhead costs of domestic commercial banks these findings which reveal that both the actual market penetration and mere presence of foreign banks seem to exert competitive pressure to domestic banks imply that foreign banks may serve as an effective competitive force reducing the excess profits earned by domestic banks and compelling domestic banks to update their production technologies and techniques to improve their cost efficiency from a policy perspective the findings on competition effects of foreign banks in the domestic banking system justify the liberalization of foreign bank entry in the philippines the main findings demonstrate that the goal of banking liberalization in transforming domestic banks to be more competitive and efficient works considerably well in the case of the philippines aside from the policy of easing the entry of foreign banks bank specific conditions can have significant impact on the performance of domestic banks therefore a sustained improvement in the efficiency of domestic commercial banks requires not only liberalizing the entry of foreign banks but also on continued strengthening of domestic prudential regulation and supervision on the commercial banking system

dynamic spillovers of oil price shocks and economic policy uncertainty this study examines the dynamic relationship between changes in oil prices and the economic policy uncertainty index for a sample of both net oil exporting and net oil importing countries over the period 1997 01 2013 06 to achieve that an extension of the diebold and yilmaz 2009 2012 dynamic spillover index based on structural decomposition is employed the results reveal that economic policy uncertainty oil price shocks responds negatively to aggregate demand oil price shocks economic policy uncertainty shocks furthermore during the great recession of 2007 2009 total spillovers increase considerably reaching unprecedented heights moreover in net terms economic policy uncertainty becomes the dominant transmitter of shocks between 1997 and 2009 while in the post 2009 period there is a significant role for supply side and oil specific demand shocks as net transmitters of spillover effects these results are important for policy makers as well as investors interested in the oil market

assessing school efficiency in portugal using fdh and bootstrapping this study explores a new data set that contains information both on inputs and outputs for a sample of portuguese secondary schools an fdh reference technology is used to determine radial technical efficiency scores and slacks although it is known that there is no reason to assume convexity in the study of education efficiency frontiers this is the first study ever to use fdh at the school level effectively relaxing the convexity assumption a two stage approach is used whereby the significant environmental variables that explain fdh efficiency scores and slacks are identified for the purpose of statistical inference the first application of the bootstrapping algorithms suggested by simar and wilson 2003 is conducted the study concludes that the unemployment rate access to health care services adult education and living infrastructures are determinants of school efficiency the differences between the coast and the interior of portugal seem to be more relevant as far as school efficiency is

an analysis of factors affecting price volatility of the us oil market abstract this paper studies the price volatility of the crude oil market by examining the market structure of opec the stable and unstable demand structure and related elasticity of demand in particular the impacts of prosperity and recession of the world economy and the resulting demand shift on crude oil price are investigated the error correction model is used to estimate the demand relations and related elasticity the income effect on demand functions is evaluated to shed light on future prices a simulation of potential oil prices under different scenarios on a cut of one million barrels per day by opec is evaluated from our simulation given the 4 cut in opec production the oil price is expected to increase unless the recession is severe the magnitude and scope of a price hike would be diminished if non opec or domestic production were greatly expanded

economic policy uncertainty in the us does it matter for the euro area abstract we investigate the effects of a us economic policy uncertainty shock on some euro area macroeconomic aggregates via structural vars we model the indicators of economic policy uncertainty recently developed by baker et al 2013 jointly with the aggregate price indexes and alternative indicators of the business cycle for the two above indicated economic areas according to our svars a one standard deviation shock to us economic policy uncertainty leads to a statistically significant fall in the european industrial production and prices of 0 12 and 0 06 respectively the contribution of the us uncertainty shock on the european aggregates is shown to be quantitatively larger than the one exerted by an euro area specific uncertainty shock

measurement of hospital efficiency using a latent class stochastic frontier model this article analyses the technical efficiency of portuguese hospitals from 1997 to 2008 with the latent class frontier model enabling the identification of different segments in the cost frontier it is found that there are three statistically significant segments in the sample leading to the conclusion that no common health policy can be applicable to all the hospitals analysed calling rather for policies conceived for each hospital segment identified the health policy based in the identified segments enables a more accurate and cost effective management of resources

on two definitions of productivity abstract caves et al in 1982 introduced a productivity measure that does not proceed from a continuous timer presentation they named these indexes after sten malmquist who in 1953 used ratios of distance functions to formulate quantity indexes in the consumer context in a later paper diewert proposed an alternative definition of productivity also based on distance functions which he attributed to hicks and moorsteen in this letter we provide necessary and sufficient conditions for the malmquist productivity index to equal the hicks moorsteen index

efficiency of hospitals in germany a dea bootstrap approach various attempts to assess the performance of german hospitals have generated a wide range of estimates regarding their efficiency these attempts were based on different often rather small data sets consisting of heterogeneous hospitals the techniques applied range from simple benchmarking approaches to studies which employ data envelopment analysis dea some studies report dramatic differences in efficiency and propose savings potentials of 50 others find an average efficiency in excess of 95 and characterize almost 75 of their observations as fully efficient this study presents results for two datasets representative of two segments of the german hospital system these segments comprise all hospitals that have one internal medicine and one surgery department the hospitals are located in the old federal states of germany none of the hospitals provides tertiary care dea can be applied because all hospitals offer a comparable quality and range of services the results were estimated with a d

time varied causality between us partisan conflict shock and crude oil return abstract to investigate the causality between us partisan conflict shock and crude oil return this paper utilizes bootstrap full sample granger causality and bootstrap rolling window sub sample granger causality tests although no evidence supports the causal nexus between partisan conflict shock and crude oil return with full sample data time varied causality is observed for particular sub samples such difference can be attributed to the parameter non constancy in the var system in terms of the empirical results the us partisan conflict shock causes the fluctuations of the crude oil market in 2008 2009 and 2014 2015 however such influence is temporary inversely the crude oil return causes us partisan shock in 1985 1986 1991 1994 1998 2000 and 2012 2013 these findings indicate crude oil market significantly affects political stability of the us especially during the periods of the gulf war and opec production cut the empirical results are robust in terms of both sample setting variation and window size selection

a technique for obtaining improved proxy estimates of minimum optimal scale in the field of industrial organization the concept of economies of scale is of fundamental importance large minimum optimum scale mos 1 and significant unit cost reduction up to mos size together suggest the possibility of high industry concentration and significant barriers to entry 2 however a recent paper in this review caves shirazi and porter 1975 has pointed to the severe difficulties encountered by students of industrial organization in empirical analyses of these relationships the chief problem is that objective measures of mos i e engineering estimates 3 and of the cost disadvantage of suboptimal scale production are available for only a small minority of all u s manufacturing industries at say the 4 digit level since there are more than 400 such industries it is most unlikely that there ever will be much change in this situation this means that in large scale cross section statistical analyses various proxies for scale economy influences must be used this is also the case in other fields of economics in which the influence of industrial organization has been recently felt in the investigation of sectoral patterns of direct foreign investment and the commodity composition of international trade for example unfortunately little has been achieved in terms of the development of reliable proxies for scale economies or minimum optimal scale this relative poverty in the data seriously jeopardizes the empirical analyses undertaken in all the above mentioned fields the present paper is a first step at overcoming this deficiency it offers a critical analysis of the proxies currently in vogue and it suggests an alternative technique for generating estimates of mos that appear to be substantially superior to them

testing scale efficiency in dea models a bootstrapping approach this paper presents a method for estimation and test of firm specific scale efficiency using data envelopment analysis dea the use of a simple bootstrap algorithm is proposed to perform firm specific inference for scale efficiency an empirical application using swedish hospital data is provided it is found that about 40 of the departments were scale efficient according to the original results however for about one third of those departments the hypothesis of scale efficiency could be rejected

does us partisan conflict matter for the euro area this paper highlights the international transmission of political uncertainty originated from a us partisan conflict shock a newly identified shock that transmits a type of uncertainty beyond the economic policy uncertainty spillovers identified by colombo 2013 using the recently developed us partisan conflict index uspc developed by azzimonti 2014 we find that a one standard deviation uspc shock leads to a 0 2 percent decline in european industrial production we also show that compared with us policy uncertainty shocks a shock to us partisan conflict creates deeper and more persistent spill over effects to the euro area

causality between foreign investment and spillover efficiency while there is considerable evidence on the observed linkage between foreign investment and technical efficiency of the developing countries the question of causality between them has not been investigated this paper re examines the relationship between foreign direct investment and technical efficiency in mexico brazil chile singapore and zambia using granger causality tests the results suggest that foreign direct investment and labour productivity are causally independent variables however capital formation of the host country is found to exert causal influence on foreign investment

foreign direct investment inflows and the industrialization of african countries summary this paper examines the relationship between inward foreign direct investment fdi and the industrialization process in africa it uses panel data from 49 countries over the period of 1980 2009 the results indicate that fdi did not have a significant impact on the industrialization of these countries while other variables such as the size of the market the financial sector and international trade were important this study concludes that the role of fdi in the transformation agenda which is currently being discussed in africa should be carefully analyzed to maximize the impact of these capital inflows

consistency in performance rankings the peru water sector regulators can utilize a number of alternative methodologies for comparing firm efficiency but these approaches need to be robust to be accepted by stakeholders this study evaluates the consistency of water utility performance rankings for peruvian water utilities the results indicate that data envelopment analysis dea and stochastic frontier analysis sfa yield similar rankings in this case in addition the techniques have comparable success for identifying the best and worst performing utilities however these rankings based on sophisticated statistical techniques are not highly correlated with those developed by the peruvian water regulator sunass this result does not invalidate the performance rankings obtained by the regulator since those rankings are based on more dimensions of utility performance however they illustrate the importance of developing sound techniques for identifying weak utilities improvements in sector performance require that benchmarking be given greater attention t

a comparative application of data envelopment analysis and translog methods an illustrative study of hospital production this paper compares inferences about hospital cost and production correspondences from two different estimation models 1 the econometric modeling of the translog cost function and 2 the application of data envelopment analysis dea while there are numerous examples of the application of each approach to empirical data this paper provides insights into the relative strengths of the estimation methods by applying both models to the same data the translog results suggest that constant reruns are operant whereas the dea results suggest that both increasing and decreasing returns to scale may be observed in different segments of the production correspondence in turn suggesting that the translog model may be averaging diametrically opposite behavior on the other hand by examining the rate of output transformation both models agree that patient days devoted to care of children are more resource intensive than those devoted to adults or to the elderly in addition we compare estimates of technical efficiencies of individual hospitals obtained from the two methods the dea estimates are found to be highly related to the capacity utilization but no such relationship was found for the translog estimates this comparative application of different estimation models to the same data to obtain inferences about the nature of underlying cost and production correspondences sheds interesting light on the strengths of each approach and suggests the need for additional research comparing estimation models using real as well as simulated data

biases in technical efficiency scores caused by intra input aggregation mathematical analysis and a dea application using simulated data in data envelopment analysis dea applications involving multiple inputs and outputs inputs are aggregated into the total amounts of each type of input for example if input types labour and capital are used to produce multiple outputs the total amount of labour used to produce all outputs is treated as one aggregated input and the total amount of capital as another resources are not disaggregated into input variables measuring the amount of labour used to produce the first output the amount of labour used to produce the second output the amount of labour used to produce the third output and so on for both labour and capital it is shown that such intra input aggregation causes downward bias in reported technical efficiency scores with variations in bias unrelated to true technical efficiency therefore with few exceptions any technical efficiency comparisons among dmus are invalid the presence of intra input aggregation bias is demonstrated mathematically simulation is used to exhibit it

impact of input substitution and output transformation on data envelopment analysis decisions abstractdata envelopment analysis dea can aid managerial decision making because it offers an opportunity to measure organizational performance in a holistic manner aggregating data from partial indicators into a single comprehensive measure however there are some methodological hazards associated with the use of dea that are especially relevant to managerial decisions but which have been largely ignored in the literature herein we identify and show the impact of a ubiquitous methodological hazard in dea modelling the economic assumptions regarding input substitutions and output transformations

on the in efficiency of swiss hospitals the efficiency of hospitals is of interest to health insurers government authorities and hospital management itself however econometric methods for determining in efficiency have severe drawbacks since hospitals are multiproduct firms and because the duality between production and cost functions cannot be assumed in this work non parametric deterministic data envelopment analysis dea is used to measure the relative inefficiency of 89 swiss hospitals covering the years 1993 1996 310 observations special attention is given to the role of patient days in the production of health the findings depend on whether patient days are viewed as an input of patient time or as an output as in previous studies while the probability of a unit being inefficient cannot be explained using the available data the degree of overall inefficiency is shown to significantly depend on the financial incentives faced by management in particular due to subsidization private hospitals do not seem to be less inefficien

the efficiency of immunization of infants by local government the paper makes use of data envelopment analysis dea to measure the cost and production efficiency of local government programmemes for childhood immunization in urban and rural settings in australia model specification is tested for validity methods are used for ranking efficient units and advanced statistical methods are used to establish confidence intervals around the efficiency estimates given the small data set the cost and production models are valid and it is concluded that while neither urban nor rural programmes are particularly efficient there is more room for improvement in rural programmes ways of changing methods of delivery are suggested which may increase efficiency

oil and the macroeconomy when prices go up and down an extension of hamilton s results in an important paper hamilton 1983 demonstrated a strong correlation between oil price changes and gross national product growth in u s data however his study pertained to a period in which all the large oil price movements were upward and thus it left unanswered the question whether the correlation persists in periods of price decline moreover the price variable he used was somewhat distorted by price controls in the 1970s this note investigates whether hamilton s results continue to hold when the sample is extended to include the recent oil market collapse and the oil price variable is corrected for the effects of price controls particular attention is given to the possibility of asymmetric responses to oil price increases and decreases as suggested in the structural employment literature loungani 1986 davis 1987 hamilton 1988 like hamilton i based my investigation on the gnp equation in sims s 1 980b six variable quarterly vector autoregressive model

determinants of technical efficiency of crop and livestock farms in poland la pologne est l un des pays d europe de l est candidats a une accession a l union europeenne qui rencontre de graves problemes de restructuration agricole l article etudie l efficacite technique en 2000 d exploitations agricoles individuelles polonaises specialisees en elevage et en grandes cultures l efficacite est estimee par la methode de frontiere stochastique et sa variabilite statistique evaluee par la construction d intervalles de confiance l article examine egalement les determinants de l efficacite les resultats obtenus pas la methode de frontiere stochastique sont compares avec ceux obtenus par la methode de data envelopment analysis dea en moyenne l efficacite technique des exploitations d elevage est superieure a celle des exploitations de grandes cultures pour les deux specialisations la relation entre l efficacite et la taille des exploitations est positive les grandes exploitations sont les plus efficaces les resultats obtenus par la methode de frontiere stochastique sont generalement confirmes par la methode dea la qualite de la terre et le degre d integration dans les marches d aval sont d importants determinants de l efficacite la faible education est un obstacle majeur a l efficacite en particulier pour les exploitations de grandes cultures de plus celles ci utilisent beaucoup les marches de facteurs terre et travail alors que les exploitations d elevage utilisent plutot leurs propres terres et le travail familial