A toolkit in SAS for the evaluation of multiple imputation methods

This paper outlines a strategy to validate multiple imputation methods. Rubin's criteria for proper multiple imputation are the point of departure. We describe a simulation method that yields insight into various aspects of bias and efficiency of the imputation process. We propose a new method for creating incomplete data under a general Missing At Random (MAR) mechanism. Software implementing the validation strategy is available as a SAS/IML module. The method is applied to investigate the behavior of polytomous regression imputation for categorical data.     

The West German economy

The World Economy And The West German Economy In The Autumn Of 1989

The West German economy     

Rezensionen

Ohne Zusammenfassung     

International trade,integration and industrial location: The case of Germany

The paper confronts empirical results on the spatial distribution of integration effects and export activities in the FRG with prediction based on different theoretical approaches. It is proved that integration has at most very slightly favoured the higher agglomerated regions, and has not been to the detriment of the periphery. Export activities contributed to regional industrial despecialization and to decreasing interregional disparities. Population potentials, calculated with different distance parameters, regional productivity, the sectoral composition of industry, and average firm size are tested as explanatory variables. The results question that there are contemporary effective ‘regional’ determinants of integration effects.