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Re: st: Survival analysis


From   moleps islon <moleps2@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Survival analysis
Date   Mon, 31 Aug 2009 10:42:25 +0200

This is the ouput I´m getting using your approach:

n=896, failures=292

stcox var,tvc(var) texp((_t>1)_t)

rh

var HR 0.64, p=0.005, CI 0.47-0.87

t
var HR 1.01,p=0.001,CI 1.01-1.03

So as far as I understand this the interpretation is that the -var- is
protective within the first 24hrs, but detrimental afterwards ??

Would you say it is sufficient to use the graph to determine the
"break-point" (_t>1) or should this be done in a more analytical
fashion?

Regards,

M


On Mon, Aug 31, 2009 at 9:01 AM, Maarten buis<maartenbuis@yahoo.co.uk> wrote:
> --- On Mon, 31/8/09, moleps islon wrote:
>> However what I´m looking for is a way to find the exact
>> time analytically from where the curves are parallel. I
>> believe the PH assumption is fulfilled before and after
>> this point.
>
> You have to be more exact about what is being parallel.
> Usually it is just another way of saying that the PH
> assumption is violated.
>
> -- Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> -----------------------------------------
>
>
>
>
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