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Re: st: Person-period dataset, stcox, subjects in analysis
Thanks a lot! I will keep that in mind,
Best wishes,
May
--- On Sun, 5/17/09, Jeph Herrin <[email protected]> wrote:
> From: Jeph Herrin <[email protected]>
> Subject: Re: st: Person-period dataset, stcox, subjects in analysis
> To: [email protected]
> Date: Sunday, May 17, 2009, 9:53 PM
> After the regression, you want to
> select
>
> keep if e(sample)
>
> hth,
> Jeph
>
> MAY BAYDOUN wrote:
> > Dear Statalisters,
> >
> > This may be a straightforward question with an obvious
> answer, but I need your help on it. I have a person-period
> dataset and I used stset command specifying origin and id as
> well as failure and exit. This gave me a specific number of
> failures and number of subjects at risk. I ran stcox using a
> variable that has missing values for a number of those
> subjects. I am trying obtain a selection variable so I can
> look at baseline characteristics of those subjects that were
> selected for this analysis. Which of the variables that were
> generated through the stset command should I be using for
> this purpose?
> >
> > stcox x
> >
> > failure _d:
> failuredem == 2
> > analysis time _t:
> (age50dem-origin)
> >
> origin: time origin==1
> > enter on or after: time
> origin2==1
> > exit on or before:
> failuredem==1
> >
> id: id
> >
> > Iteration 0: log likelihood =
> -1697.8111
> > Iteration 1: log likelihood =
> -1696.3502
> > Iteration 2: log likelihood =
> -1696.3477
> > Refining estimates:
> > Iteration 0: log likelihood =
> -1696.3477
> >
> > Cox regression -- Breslow method for ties
> >
> > No. of subjects = 2321
>
> Number of obs =
> 15721
> > No. of failures = 270
> > Time at risk = 52641.86847
> >
>
>
> LR chi2(1) =
> 2.93
> > Log likelihood
> = -1696.3477
> Prob
> > chi2 = 0.0871
> >
> >
> ------------------------------------------------------------------------------
> > _t | Haz.
> Ratio Std. Err. z
> P>|z| [95% Conf.
> Interval]
> >
> -------------+----------------------------------------------------------------
> >
> x| 1.247601 .159471
> 1.73 0.084
> .9711212 1.602796
> >
> ------------------------------------------------------------------------------
> >
> > So, basically, I want to be able to describe the 2,321
> subjects in that analysis. I did that before, but I can't
> remember how anymore. Thanks for any help you can provide,
> >
> >
> > Sincerely,
> >
> > May
> >
> >
> >
> >
> >
> >
> >
> > *
> > * For searches and help try:
> > * http://www.stata.com/help.cgi?search
> > * http://www.stata.com/support/statalist/faq
> > * http://www.ats.ucla.edu/stat/stata/
> >
> *
> * For searches and help try:
> * http://www.stata.com/help.cgi?search
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
>
*
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