It's difficult to guess what the pb is without the data. Try to estimate a 'simple' model, ie without the dummies (something like :
dsnfi3LP=plm(lnLP~lnC+lnL+lnM +lnE,data=newdata,effect="twoways",model="within") Try also pdim(newdata) to check if you don't have 1 observation for some individuals. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
