Dear Statalist,
I have a question on the cluster option in ivreg2, gmm. My understanding of
the cluster option is to make standard errors robust to arbitrary
intra-cluster correlation and that the cluster option does not change
coefficient estimates. Does this apply to GMM estimation (ivreg2 with the
gmm option)? I got different coefficient estimates with and without the
cluster option in the command ivreg2, gmm.
Thank you very much for your help.
Eiji
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