Re: st: test survival curve differences at 5, 10, 15 year cut points

[Lars Kroll <lars@climweb.de>]

Hi Joseph,

I'm not quite sure what you want but I suppose you'd like coparisons of 
ranges of time not of points in time?

The solution would be like this one with a sample dataset:

. use http://www.stata-press.com/data/r9/stan3.dta
(snip)

. sts test surgery if inrange(_t,0,17)
(snip)

. sts test surgery if inrange(_t,17,183)
(snip)

Hope this helps,

Lars
____________________________
Lars E. Kroll
WEB www.lkroll.de



Wagner, Joseph schrieb:


> I have been asked to test the difference between two lines on a KM graph
> at 5, 10, and 15 year points.  I had originally intended to use -sts
> test- but there isn't the option -at(5 10 15)- like there is with -sts
> list- (but the option -test- isn't allowed when the -at- option is used)
> and I prefer to not create new variables for 5, 10, 15 year endpoints.
> I am at a loss how to do this.  Ideally, I want a single graph with the
> test coefficient at each 5 year point.  (I am using version 8)
>
> Here are my -stset- and -stcox- statements:
>
> stset datelr, id(patkey) failure(death_yn) origin(dxdate) scale(365.25) 
> stcox type agedxfr race sex, nolog 
> sts list, by(type) adjustfor(agedxfr race sex) compare at(5 10 15)
>
>
> I have considered using different -exit- options with -stset- but I
> don't think you can specify an exit of 5 years post-entrance.  Correct
> me if I am wrong.
>
>
>
>
>
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