hanbaba66 发表于 2018-1-22 15:02 
您好,遇到与楼主类似的问题,请问楼主最后是怎样解决的,或者有其他的小伙伴已经找到解决办法了,望指教, ...
也遇到了负值的问题,0有一个论文处理方法是用ln(1+FDI),详见《The determinants of FDI and the impact of the economic crisis on the implementation of RTAs: A static and dynamic gravity model》
这个是原话:
Eichengreen and Irwin (1995)proposed a simple transformation to address the problem of zeros: work with ln(1 + FDI) it instead of the naturallogarithm of FDI