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Re: st: interpreting output in survival analysis


From   "Yusvita Triwiadhian S." <07.5544@stis.ac.id>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: interpreting output in survival analysis
Date   Mon, 30 May 2011 22:41:04 +0700

thank you very much. it's very helpful for me. if i want to take cox
with frailty, can i use stata?

On Mon, May 30, 2011 at 2:09 PM, Maarten Buis <maartenlbuis@gmail.com> wrote:
> On Sun, May 29, 2011 at 7:40 PM, Yusvita Triwiadhian S. wrote:
>> i have a problem to interpret output of survival analysis specially
>> output of gompertz regression gamma frailty..
>>
>>   t        |      Coef.                 Std. Err.      z    P>|z|
>> [95% Conf. Interval]
>> gamma |   .0007606   .         0011992     0.63   0.526    -.0015898     .003111
>>
>> please let me know, what it means of gamma and how about if p-value of
>> gamma >0.5?
>
> The parameter gamma is part of the Gompertz model, and confusingly not
> of the gamma frailty sub-model. If the gamma equals 0, the Gompertz
> distribution is equal to the exponential distribution. In other words,
> in that case the baseline hazard does not change over time. In your
> case the gamma is very small and the statistical test clearly
> indicates that the hypothesis that gamma equals 0 cannot be rejected,
> so I would conclude that the baseline hazard is constant.
>
> 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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