在R语言中用plm包做面板数据时出现下面的bug,
面板数据中有缺失值,但是plm应该是可以处理非平衡面板数据的啊?
为什么会出现下面的状况,求大神指教。
> result1<-plm(form,data=data,model="within")
at least one couple (id-time) has NA in at least one index dimensionin resulting pdata.frame
to find out which, use e.g.table(index(your_pdataframe), useNA = "ifany")
Error in model.matrix.pdata.frame(data, rhs = 1, model = model, effect = effect, :
NA in the individual index variable


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