Talk:Energy intensity

message: Economic Energy Efficiency: This term may be referred to as something else by economists; the author (Petercorless) coined it simply because he has not encountered a formal term for this value yet. Comments and correction welcome.
Units should be energy/currency, right? lordspaz 23:10, 15 June 2007 (UTC)

message: The graphs of this article are confusing and require quite some math to be compared with each other. The quantity to measure energy intensity is MJ/$ in the first, but $/MBTU in the latter. Thus, not only they have different units -- with BTU being absolutely obsolete from both scientific and European practical viewpoints -- but the measures are also reciprocals of each other. This is fairly confusing. 82.118.198.121 14:25, 1 August 2007 (UTC)
thread_title:  Differing graphs 

message: I am looking at the bottom graph ... I like this because it takes a point in time and compares different countries.  However:
First - I would expect energy efficiency to reflect energy use over GDP - this has it flipped.  This is how both engineers and economists view the world in terms of Input - Output relationships.  ... for the economist, the Leontief total requirements would be Energy input / GDP (output); also called Leontief technical coefficient.  For the engineer this is the consumption factor in the production cost buildup
In other words, energy consumption divided by GDP gives the amount of energy used in making gross product (output); as shown this should be called an energy GDP multiplier.
Second the bottom chart shows groupings by energy inefficient, moderately energy efficient and highly energy efficient - the labels are wrong - this suggests that the US, Euro, Japan etc. are energy inefficient and Bangladesh and the Philippines are highly energy efficient (!!).
Third, normally relationships show as independent vs. dependent variables which requires the y and x axes to be exchanged.
Fourth - if the relationship is between energy/GDP and GDP/capita these two ratios are cointegrated and any mathematical or visual representation gives an invalid interpretation.  Not sure of the significance of the comment on use of "BTU" - from a Euro point of view ... BTU is used in other parts of the world ... what are you suggesting - have two charts ?   ... when did Wiki become a EU web site?   Davebecher (talk) 08:36, 18 December 2008 (UTC)
thread_title:  The second graph is incorrect  

message: The data in the first graph do not match the supplied source. In particular, energy consumption per unit of GDP is far higher in China than in any of the other countries in the graph (including Norway). The source uses BTU per 2000 PPP US dollar, so the author of the graph may have introduced mistakes when converting units. The graph should be replaced with a correct one. Faagel (talk) 09:52, 30 December 2011 (UTC)
thread_title:  The first graph does not match the source data 

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