Message-ID: <3EA35B77.6050200@pdf.com>
Date: 2003-04-21T02:46:15Z
From: Spencer Graves
Subject: To create a Panel and run a Pooled OLS
Have you tried the following:
OLS <- lm(Panel$y~Panel$x1+Panel$x2, data=Panel)
If yes, could you replicate the error with a small data set that you
send with your help request? It can make it easier for others to
diagnose.
Hope this helps. spencer graves
langensk at fas.harvard.edu wrote:
>
> Dear all,
>
> I have tried to merge two cross sections (crossA and crossB) as follows, both
> crossA and crossB include the same variables, e.g., ID,y,x1,x2:
>
> Panel <- merge(crossA,crossB,by="ID")
>
> I have, thereafter, tried to run the following pooled OLS:
>
> OLS <- lm(Panel$y~Panel$x1+Panel$x2)
>
> and have received the following error message "Error in model.frame(formula,
> rownames, variables, varnames, extras, extranames, : invalid variable type"
>
> I would be very grateful for help. At the moment, I believe that I have tried
> everything.
>
> Thanks in advance,
> Sophie
>
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