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Re: st: how to handle clustering


From   Kate Welti <kate.perper@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: how to handle clustering
Date   Thu, 29 Jul 2010 13:49:42 -0400

Thanks for the tip!  Unfortunately they are not balanced but I guess I
will do the best I can with vce(cluser classroom).


On Thu, Jul 29, 2010 at 1:27 PM, Austin Nichols <austinnichols@gmail.com> wrote:
> Kate Welti <kate.perper@gmail.com> :
> Are clusters balanced (roughly equal number of kids per classroom)?
> If so, use the vce(cluster classroom) option to get correct SEs.  If
> not, still use it, but be aware that SEs may be biased downward.  See
> http://www.stata.com/meeting/13uk/nichols_crse.pdf and refs therein,
> esp. Rogers and Kezdi (both linked from the PDF).
>
> On Thu, Jul 29, 2010 at 1:07 PM, Kate Welti <kate.perper@gmail.com> wrote:
>> I have 255 children and 37 classrooms.
>>
>>
>> On Thu, Jul 29, 2010 at 11:48 AM, Jeph Herrin <stata@spandrel.net> wrote:
>>> It would be helpful to know how many classrooms and children you
>>> have.
>>>
>>> On 7/29/2010 11:36 AM, Kate Welti wrote:
>>>>
>>>> Hello,
>>>>
>>>> I am analyzing data in which I have treatment and control classrooms
>>>> (intervention was at the classroom level) and child-level test scores.
>>>>  Ideally, I would use a multi-level model, however, I don't have
>>>> enough classrooms and children to do so (according to a power
>>>> analysis).  I need to find a way to control for the clustering of
>>>> children in classrooms.  Can Stata's cluster option be used in this
>>>> instance?
>>>>
>>>> Thanks,
>>>>
>>>> Kate
>>>>
>
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-- 

Kate (Perper) Welti
202-744-2413

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