Re: st: peer variable coefficient estimate nonsense

[Jian Zhang <jian32@gmail.com>]

Nick, thanks for your comment.  the correlation between age and peer
average age is quite high, about -0.7


On Thu, Mar 1, 2012 at 3:56 PM, Nick Cox <njcoxstata@gmail.com> wrote:
> You need to think very carefully how to parameterise this. You don't
> give any comment on how far these age variables are correlated. You
> might be better off with a different representation, e.g. predictors
> of
>
> age, (peer average - age)
>
> Nick
>
> On Thu, Mar 1, 2012 at 7:45 AM, Jian Zhang <jian32@gmail.com> wrote:
>
>> I was running a OLS regression of student scores on her/her own age
>> and his/her peers' average age. The results show that the coefficient
>> estimate of the peer average age is much much larger than own age
>> estimate.  This does not not seem to be plausible as one would believe
>> that own age would matter much more than peer average age to own
>> scores.  any thoughts/comments?  looks like whenever adding peer
>> characteristics, the regression results does not make sense!
>
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-- 
Jian Zhang（张舰）
Assistant Professor
School of Economics
Central University of Finance and Economics, Beijing, China 100081
Email: jian32@gmail.com
Cell Phone: 86 - 137 188 65377
Web Page: http://econ.cufe.edu.cn/zhang

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