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Re: st: RE: RE: estimation with a time trend.


From   natasha agarwal <agarwana2@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: estimation with a time trend.
Date   Mon, 5 Jul 2010 12:38:17 +0100

On Mon, Jul 5, 2010 at 11:03 AM, Nick Cox <n.j.cox@durham.ac.uk> wrote:
> As -egen, group()- maps to 1 ... whatever regardless of gaps, this might
> in fact make things worse. What's wrong with -year- (or -year- MINUS
> midpoint) for interpretability?

I am afraid I did not understand "year- (or -year- MINUS> midpoint)
for interpretability?"

Thanks
Natasha

> Nick
> n.j.cox@durham.ac.uk
>
> Martin Weiss
>
> Your code maps years in your dataset to integer numbers, and I am not
> sure
> that it gets you any closer to your final destination. So far, it has
> not
> hurt either...
>
> natasha agarwal
>
> I was trying to estimate a production function with an unbalanced
> firm-year panel data and wanted to include a time trend. However I was
> not sure if the time trend was created correctly.
>
> egen t=group(year)
>
> I was wondering if anyone could please tell me if this was correct?
>
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