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st: RE: Derivative of Kaplan-Meier curves


From   "FEIVESON, ALAN H. (AL) (JSC-SK) (NASA)" <alan.h.feiveson@nasa.gov>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Derivative of Kaplan-Meier curves
Date   Mon, 16 Jun 2003 12:42:59 -0500

Kaplan-Meier "curves" are step functions. Thus their derivatives are either
zero (between observations) or undefined (at the observations).

Al Feiveson

-----Original Message-----
From: Nick Cox [mailto:n.j.cox@durham.ac.uk]
Sent: Monday, June 16, 2003 11:59 AM
To: statalist@hsphsun2.harvard.edu
Cc: smurphy@perfuse.org
Subject: st: Derivative of Kaplan-Meier curves 


Sabina A. Murphy [smurphy@perfuse.org] sent this
to me. Please copy any answer to her.

Do you know if Stata can graph the first derivative of Kaplan Meier
curves, and if so, how it is programmed? I have no problem creating
the
KM curves but have not been able to figure out how to graph the
functions.

Nick
n.j.cox@durham.ac.uk

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