Monday, January 02, 2006

st: Question: obtaining robust standard errors from Poisson regressions

Hello,

I'm writing with a question about obtaining robust standard errors from a Poisson regression. Specifically, I would like to know if it's possible to obtain robust standard errors that are valid under any arbitrary assumption about the conditional variance (as discussed, for example, on p. 650-651 in Wooldridge 2002).

I looked at both the "poisson" and the "vce_option" entries in the Stata reference manual. It's not clear to me whether any of these options can produce standard errors that are valid under any assumption about the conditional variance. I presume that by default, the poisson command displays estimated standard errors that are valid only under the assumption that the conditional variance equals the conditional mean.

I would greatly appreciate any advice. I can be reached at stephen_lin35@hotmail.com Thank you.

Best,

Steve

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