This paper presents three procedures for testing specifications of regression models. The first procedure is parametric and it tests the specification of an unconditional moment restriction model against a nonnested unconditional moment restriction model. The second procedure is nonparametric...

This paper uses the latest provincial data to study the productivity implications of ownership diversi¡¥cation in China's industry. It investigates the different performance of di?erent ownership sectors. It is found that there are significant differences in both production technology and the...