根据AMJ上2014年发表的《FDI Spillovers over Time in an Emerging Market: The Roles of Entry Tenure and Barriers to Imitation》一文,先检验用面板方法还是混合OLS(Breusch-Pagan拉格朗日乘数测试)。如果应该用面板方法,再检验用FE还是RE(豪斯曼检验)。
原文如下:Based upon Wooldridge (2002), we adopted the following procedures for data analyses. First, we used the Breusch-Pagan Lagrange multiplier test to decide whether the panel data method or the pooled ordinary least squares approach was more appropriate. The results of the test suggested that unobserved individual effects existed in the data. Thus, the panel data method was used because this method can model the unobserved individual ef- fects associated with the same units. Second, for the panel data method, we needed to choose be- tween fixed effect and random effect models. The results of Hausman test revealed that explanatory variables were correlated with the unobserved ef- fects, and, thus, fixed effect models should be used.