Re: st: Two baselines in stpiece

["Marika Jalovaara" <marika.jalovaara@helsinki.fi>]

Quoting "Maarten Buis" <maartenlbuis@gmail.com>:

> On Wed, Oct 5, 2011 at 11:34 AM, Marika Jalovaara wrote:
> > I'm using stpiece (or streg) to fit piecewise constant models. I'm wondering
> > whether it is possible to have separate baseline risks for two groups of
> > observations (say, dummy Group).
> >
> > Fitting separate models for the two groups doesn't work because I should
> > perform tests of statistical significance for interactions between Group and
> > other covariates.
>
> -stpiece- is user written. The Statalist FAQ asks you to specify where
> you got user written software from. The reason for that is that there
> are often multiple versions of the same user written program floating
> around cyber space, and we obviously cannot answer questions about
> unknown pieces of software. Typically, we will guess which version you
> are using, but often that just leads to more confusion when we guess
> wrong. So for all involved it is better to just read the FAQ and
> follow the advise given in it, a link can be found at the bottom of
> every post on statalist (including this one). Below I will assume you
> have downloaded -stpiece- from SSC by typing in Stata -ssc install
> stpiece-.
>
> With the -tv()- option you can enter interaction terms between the
> baseline hazard and some variable. This is typically interpreted as
> allowing the effect of that variable to change over time, but since
> interaction terms are symetric you can also interpret this as allowing
> the baseline hazard to be different for different values of that
> variable.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
>
> http://www.maartenbuis.nl
> --------------------------
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The -tv()- option did it. Thank you!
Marika



--
Marika Jalovaara
post-doctoral researcher
Department of Social Studies, University of Helsinki
http://blogs.helsinki.fi/jalovaar/


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