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Re: st: Clustering of Standard Errors in a fixed effect model.

From   Austin Nichols <>
Subject   Re: st: Clustering of Standard Errors in a fixed effect model.
Date   Mon, 21 Jun 2010 08:34:54 -0400

natasha agarwal <> :
The number of clusters and how balanced they are determine the
tradeoff--see e.g.
and refs therein, and for the follow-up see

On Mon, Jun 21, 2010 at 7:22 AM, natasha agarwal
<> wrote:
> Dear Everyone,
> I am trying to estimate an augmented production function where am
> attempting to measure the effect of aggregate variable (FDI in a
> region) on micro units (productivity of domestic firms). I use an
> unbalanced panel data which spans for 5 years.
> According to Moultan (1986) paper titled "An illustration of a pitfall
> in estimating the effects of aggregate variables on micro units", it
> mentions that is is essential to cluster at the aggregate level when
> an aggregate regressor is specified in the right-hand side.
> However, Woolridge 2002 in his book Cross-Section and Panel Data
> mentions that clustering at the aggregate level when the number of
> groups is less than the group size might not be correct.
> I was wondering, if anyone could explain me what happens if one tries
> to cluster at the aggregate level in a fixed effect model when the
> group size (cluster size) is greater than number of groups (number of
> clusters)?
> Thanks
> Natasha
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