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st: confidence intervals for lowess plot

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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.



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

-----Messaggio originale-----
Da: per conto di Maarten Buis
Inviato: ven 13/10/2006 10.08
Oggetto: st: RE: Cox regression: saving estimates
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:


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

--- Michael McCulloch wrote:
> I am comparing many different models of a Cox regression in a graph.
> 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.

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