--- On Tue, 1/9/09, moleps islon wrote:
> http://picasaweb.google.no/moleps2/Skrivebord#5376581559320130946
This is the wrong graph to assess whether the proportional hazard
assumption is violated. You need to use -stphplot- instead (see:
-help stphplot-).
Anyhow, I don't think that -stcox- is applicable in your case.
-stcox- assumes that everybody eventually experiences the event,
and those that haven't experienced it in the study period will
do so later. However in your case a substantial proportion
(60-75%) appears to be cured (flattening of the hazard curve).
See: Paul C. Lambert (2007) Modeling of the cure fraction in
survival studies. The Stata Journal, 7(3): 351-375.
http://www.stata-journal.com/article.html?article=st0131
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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