I suspect it is because you have gaps in your time variable:
= di in ye _col(25) `"year, 1987 to 2007, but with gaps"'
Scott
On Feb 12, 2008 1:28 AM, Koksal, Bulent <[email protected]> wrote:
> I pasted the outcome below. I am using Stata/SE 10.
>
> In the following regression, region, and year are the cross section
> and time variables respectively.
>
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