st: Seemingly unrelated logistic regression (SUR logit) vs. -suest-

["Hogerbrugge, M.J.A. (Martijn)" <M.J.A.Hogerbrugge@uu.nl>]

Dear Stata users,

I am currently analysing 4 binary DVs for which I have reason to believe that they are correlated. To complicate things, I have a large number of missings for one of the DVs.

If I want to run a seemingly unrelated logistic regression, would it be somehow possible to include all cases, even those which have a missing on one of the DVs? 

If not, I believe the -suest- might be a good alternative, as it allows the user to compare models/equations that use different/unequal sample sizes. But does -suest- really take into account that DVs are correlated? In other words, to what extent is the -suest- command really a Seemingly Unrelated ESTtimation?

The latter question is triggered by my observation that the SEs of the coefficients of the separately estimated logistic regressions are identical to the ones that are printed after combining the estimations of the separate models using -suest-. Although identical SEs seem to occur only when I use the -vce cluster- option. Is the simultaneous use of logit models with clustered data using the -suest- postestimation not possible? Or is it correct that the SEs no longer differ from single estimations if the -vce cluser- option is used?

I look forward to any advice regarding these issues.

With kind regards,
Martijn Hogerbrugge
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