Dear R help,
I use the package plm the function plm() to analyse a panel data and
estimate a fixeffect model.
I use the code as follow :
fe <- plm(y~x+z, data, model = "within")
But I had a error message
Error in model.frame.default(form, ...) : object is not a matrix
I don't what's wrong. Beacuse others use the same codes and data,the code
can work.
I consult the paper plm.pdf , but I can't find any answer.
Thanks,
I really would appreciate some suggestions.
Helen Chen
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