One of your variables is probably a string. Use -desc- to find out which
one, convert to a numeric format, and try again.
Lee Sieswerda
> -----Original Message-----
> From: Joel Clovis [SMTP:[email protected]]
> Sent: Monday, September 09, 2002 9:15 AM
> To: [email protected]
> Subject: st: Calculating means to use in later regressions
>
> Hello Stata users,
>
> I have a variable called Country (list of county names) and another called
>
> period (1 to 4 representing the decades 1960s through 1990s); and yet
> another called RealGDP (annual realGDP per capita by country). How can
> I generate a the mean of each period for each country? I would ideally
> like
> to end up with a new variable which can be used to run cross-country
> regression on the decade aveages.
>
>
> . collapse (mean) RealGDP, by(Country period)
> type mismatch
> r(109);
>
> is clearly not working, nor is:
>
> . by period, sort: gen AveRealGDP=sum(RealGDP)/sum(RealGDP~=.)
> type mismatch
> r(109);
>
> . for Country: egen RealGDPbar = mean(RealGDP), by period
> "Country" invalid list type
> r(198);
>
> So I'm stuck. Can anyone help?
>
> Best regards,
>
> Joel Clovis
> Joel Clovis
>
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