Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: confidence intervals for lowess plot


From   <enzo.coviello@alice.it>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: confidence intervals for lowess plot
Date   Fri, 13 Oct 2006 14:17:07 +0200

Dear Stata Users,

I am fitting a Cox regression model and want to check ph assumption using a lowees smooth of the scaled Schoenfeld residual (estat phtest).

I ask you if there is a way to plot also a pointwise confidence interval for the smoothed valued of the Shoenfeld residuals. It could be useful to assess if the ph assumption hold checking if the confidence intervals contain a constant hazard ratio.

Thanks

Enzo

Enzo Coviello
Dipartimento Prevenzione ASL BAT/1
via Fornaci 201 - 70031 ANDRIA (Italy)




-----Messaggio originale-----
Da: owner-statalist@hsphsun2.harvard.edu per conto di Maarten Buis
Inviato: ven 13/10/2006 10.08
A: statalist@hsphsun2.harvard.edu
Oggetto: st: RE: Cox regression: saving estimates
 
Michael:
Roger Newson had a paper in the Stata Journal discussing exactly how to do these kind of things:

Newson R. Confidence intervals and p-values for delivery to the end user. The Stata Journal 2003; 3(3): 245-269

He has a pre-publication draft of this paper on his website: http://www.imperial.ac.uk/nhli/r.newson/

HTH,
Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology 
Vrije Universiteit Amsterdam 
Boelelaan 1081 
1081 HV Amsterdam 
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434 

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------

--- Michael McCulloch wrote:
> I am comparing many different models of a Cox regression in a graph.
<snip>
> I would like to save the effect size and their lower and upper confidence
> limits in a separate dataset, along with a label for the method, so that I
> can display them in a graph, so I don't need to enter them manually.


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

<<winmail.dat>>




© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index