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Re: st: specify base year for interacted factor variable.
From
Daifeng He <[email protected]>
To
[email protected]
Subject
Re: st: specify base year for interacted factor variable.
Date
Thu, 17 May 2012 21:20:33 -0400
Brendan,
Thanks for your reply. Yes, -xtreg y ib1999.year#c.x ib1999.year,
i(id) fe- have the same problem. Still 2001 got dropped.
But -xtreg y ib1999.year##c.x, i(id) fe- works. x is
time-invariant in my model, so I didn't want to include it as as a
level term, but even if I included it, it would just be dropped by
Stata. So your second method works good.
Thanks again for the help and have a nice evening!
Daifeng
On Thu, May 17, 2012 at 4:30 PM, Brendan Halpin <[email protected]> wrote:
> On Thu, May 17 2012, Daifeng He wrote:
>
>> . xtreg y ib1999.year#c.x i.year, i(id) fe
>
> Does the problem also arise with
>
> . xtreg y ib1999.year#c.x ib1999.year, i(id) fe
>
> or (perhaps you have a reason for not including the first order effect
> of x)
>
> . xtreg y ib1999.year##c.x, i(id) fe
>
>
> Brendan
> --
> Brendan Halpin, Department of Sociology, University of Limerick, Ireland
> Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F1-009 x 3147
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