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Re: st: Interpretation of regressionmodel of ln-transformed variable


From   "roland andersson" <rolandersson@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Interpretation of regressionmodel of ln-transformed variable
Date   Thu, 6 Nov 2008 23:56:17 +0100

Yes it converged with family(gamma) and after I had removed some
covariates. Can someone tell med what an analysis with family(gamma)
link(power -1) means?

I think this gets too complicated and the difference in LOS is so
small that it has no importance. I will content with stating there was
no difference in median LOS and use Mann-Whitney test and skip the
modelling of the LOS.

Thanks for all your input

Roland


2008/11/6 Nick Cox <n.j.cox@durham.ac.uk>:
> Sometimes a gamma family works well for reciprocal links.
>
> Nick
> n.j.cox@durham.ac.uk
>
> roland andersson
>
> Thank you Peter
>
> I tried that but unfortunately the model did not converge.
>
> 2008/11/6 Lachenbruch, Peter <Peter.Lachenbruch@oregonstate.edu>:
>
>> You need a space between power and -1
>> Check the help for glm
>
> Roland andersson
>
>> I tried the model
>>
>> xi: glm lengthof stay lapscopy i.appdgn2 i.alderk prepermalign
>> precardioscleros  preperdiabetes cons, eform link(power-1) nocons
>> and get an error message "unrecognized command:  power"
>>
>
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