Panel data econometrics : future directions : papers in honour of professor Pietro Balestra Growth rate convergence fact or artifact An essay on panel data econometrics Marc Nerlove Do panel data rescue the purchasing power parity (PPP) theory G.S. Maddala Shaowen Wu and Peter C. Liu Neglected heterogeneity and dynamics in cross country savings regressions Nadeem U. Haque M. Hasem Pesaran and Sunil Sharma Panel data estimation of the intergenerational correlation of incomes Ramses Abul Naga and Jaya Krishnakumar Life expectancy and related indicators as measures of development : the case of Switzerland Gabrielle Antille and Jacques Silber Nonlinear panel data models with dynamic heterogeneity Christian Gourieroux and Joanna Jasiak On the usefulness of banks panel data in the empirical analysis of credit markets : a note Patrick Sevestre Aggregating time unbalanced panel observations : methodology and application to oil consumption of boiler rooms Fabrizio Carlevaro and Jean Luc Bertholet To pool or not to pool panel data Cheng Hsiao and Baohong Sun A score test for individual heteroscedasticity in a one way error components model Alberto Holly and Lucien Gardiol Aggregation and unit roots in economic time series Attila Hornok and L(c)Łszl(c)đ M(c)Łty(c)Łs Kernel M estimators and functional residuals plots Christian Gourieroux Alain Monfort and Carlos Tenreiro Further evidence on the efficiency of least squares in regression models Badi H. Baltagi Balestras contribution in the field of economic growth income distribution and capital accumulation Mauro L. Baranzini Public debt in the European Union countries : two ways of facing the problem Luigi L. Pasinetti