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Re: st: RRR with CI from logit model


From   Ronán Conroy <rconroy@rcsi.ie>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RRR with CI from logit model
Date   Tue, 02 Nov 2004 16:26:22 +0000

jmpsouza@usp.br wrote:


Dear Statalisters:
let me enter late at this thread, to remind that -binreg- or -glm- f(bin)
link(log) many times fail to converge, in situations when logistic runs well.
Cheers,
Jose Maria


Jose Maria and I have different experiences of -binreg-. This week I have run a whole bunch of regressions that did, indeed, converge, and I reckon that more than 80% of the models I've tried have converged.
One strategy to getting -binreg- to run is to avoid adding all potential confounders to the model. Use -logistic- to identify important confounders and then run -binreg- on the resulting model. A few -binreg- models initially failed to converge for me, but I realised that the person who had done the original analysis had added a number of unimportant predictor variables. Once these were pruned, the stuff ran.

Relative risks make so much more sense than odds ratios (at least to me - I'm just a keyboard player) that I always try -binreg- in situations where the data represent incidences.

--

Ronan M Conroy (rconroy@rcsi.ie) Senior Lecturer in Biostatistics Royal College of Surgeons Dublin 2, Ireland +353 1 402 2431 (fax 2764) -------------------- Just say no to drug reps http://www.nofreelunch.org/

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