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Cameron and Trivedi, MUS, Stata Press 2009, is an excellent reference
for the subject of cluster-robust covariance matrices and the
difficulties that arise when clustering effects are ignored.
Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html
On Feb 13, 2009, at 02:33 , Martin wrote:
Baum(2006), p.138-139 is a possible reference. See
http://www.stata-press.com/books/imeus.html
The reference probably will not support your suspicion that the -
cluster-
vce estimator is "improper", though. Official Stata is in my
experience
quite careful when it comes to new and unproven methods, so it is
probably
safe to assume that -cluster()- is indeed proper statistics...
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