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Re: st: how to handle clustering

From   Austin Nichols <>
Subject   Re: st: how to handle clustering
Date   Thu, 29 Jul 2010 13:27:52 -0400

Kate Welti <> :
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 and refs therein,
esp. Rogers and Kezdi (both linked from the PDF).

On Thu, Jul 29, 2010 at 1:07 PM, Kate Welti <> wrote:
> I have 255 children and 37 classrooms.
> On Thu, Jul 29, 2010 at 11:48 AM, Jeph Herrin <> 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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