on gravity modeling and estimation for international trade and migration and on domestic firm-level labor market effects … distance coefficient increases over time when standard estimators are used, while a non-linear estimation of the newly … developed estimation leads to a decline in the distance coefficient over time. This shows that the distance puzzle, thus, arises …

The present book is a collection of panel data papers, both theoretical and applied. Theoretical topics include … methodology papers on panel data probit models, treatment models, error component models with an ARMA process on the time specific … panel data, which was held at the Academy of Sciences in Berlin in July of 2002, is dedicated to the memory of G. S. Maddala …