I doubt that anything is wrong with Tony's model except that
-eform("exp(b)")- should just be -eform-.
Nick
roland andersson
Peter and Maarten
I am sorry Peter. Your model is not accepted by Stata. I tried
different alternativ without success.
However I tried Maarten GLM model
xi: glm studytime i.drug c_age cons, family(gaussian) link(log) nocons
eform
on my data and got a different result compared to the regress of the
lnLOS. Now laparoscopy has shorter LOS. Which method is correct?
2008/11/5 Lachenbruch, Peter <[email protected]>:
> The issue seems to be that hospitals have a closure date on stay when
> you are doing a study after patients are certain (or almost certain)
to
> have been discharged (e.g., all records are from admissions at least a
> year old).
>
> An alternative model might fit the reciprocal of the mean rather than
> the log of the observations (thus obviating problems with 0 days of
stay
> - e.g. an outpatient visit to the ER) in this case you could use
> generalized linear models to get
> xi: glm LOS lapscopic i.appdgn age agesq cons, eform("exp(b)")
> link(power -1) nocons
>
>
> Tony
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