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Hello, I have an unbalanced panel dataset and would like to exclude all objects that don't appear at least x times. Therefore, I would like to include a column indicating for every line how many periods are available, e...
Hi Tanveer, the PLM package includes the possibility to estimate instrumental variable models. It also includes a function PGMM to estimate GMM models. Try ?pgmm... By the way, if you manage to make this function work, I'd be glad...
Hello everybody, I'm running a panel regression with dummy variables controlling for years. While this works fine for most of my models, in some cases I get the error message "In sqrt(diag(object$vcov)) : NaNs wurden erzeugt" and...
Hello everybody, I have a problem with the the function PVCM in the plm package: I have an unbalanced panel with over 200 companies and 1 to 14 years for each company. I already excluded all NAs: > dataset<-na.omit...
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