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Re: st: conception confusion - "fixed effects" and time effect on data with time factor


From   House Wang <jwanghouse@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: conception confusion - "fixed effects" and time effect on data with time factor
Date   Mon, 17 Oct 2011 20:15:50 -0500

Richard,

Thanks for your quick response.

Yes, the data is like survey done across 30 years, each time with same
measures, but on different persons.
How could I understand time effect on this kind of data? Is there fixed
effects on them? and how to test them?
Thanks.

Jianying


On Mon, Oct 17, 2011 at 8:50 PM, Richard Williams
<richardwilliams.ndu@gmail.com> wrote:
>
> At 07:01 PM 10/17/2011, House Wang wrote:
>>
>> Folks,
>>
>> Very sorry to bother you on this tricky question.
>>
>> My data is not a typical longitudinal (panel) data: they are not
>> observations on the same subjects across 30 years, but observations on
>> similar subjects across 30 years (like different persons in different
>> years).
>
> What do you mean by "similar"? Were subjects actually matched across time with similar counterparts?
>
> I'm guessing you mean you have successive cross-sections, e.g. some sort of study that was done 30 straight years, each time with a different sample. In the US, this would be like the General Social Survey.
>
> Another issue is, do you have the same measures across time, or are there a lot of changes from one year to the next?
>
> If you can clarify exactly what it is you have, that may help.
>
>
> -------------------------------------------
> Richard Williams, Notre Dame Dept of Sociology
> OFFICE: (574)631-6668, (574)631-6463
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>
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