We derive asymptotic properties of estimators and test statistics to determine - in a grouped data setting - common versus group-specific factors. Despite the fact that our test statistic for the number of common factors, under the null, involves a parameter at the boundary (related to unit...

This paper examines the pattern of foreign direct investment (FDI) in producer services. We develop a model of FDI in these services and test its predictions using panel data on U.S. FDI in 25 host countries from 1976 to 1995. We find evidence that, in addition to governmental and cultural...