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Re: st: stgtcalc and stset in version 5


From   Enzo Coviello <enzo.coviello@alice.it>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: stgtcalc and stset in version 5
Date   Mon, 06 Nov 2006 07:33:36 +0100

At 16.05 03/11/2006, you wrote:
Dear all,
I have a problem using stgtcalc:
In order to test Proportional Hazards assumption in a Cox model, I would
like to follow Patrick Royston and Peter Sasieni's suggestion
(http://www.stata.com/meeting/4uk/nonprop.html) and fit fractional
polynomials to the local estimates of the regression coefficients of the Cox
model by using fracpoly after stgtcalc.
I am using Stata9 and when I try to use stgtcalc as follows:
***
stset time trtt
stcox sex  agecateg2 agecateg3
stgtcalc

To use -stgtcalc you should use the old syntax of -stset but it should not be necessary if you have Stata 6 or a more recent version.
Actually -stgtcalc computes scaled schoenfeld residuals and then -stgtplot creates a graph by running. So you can obtain the same results saving scaled Schoenfeld by using -scaled(newvars) in -stcox and then smoothing them with fracpoly or lowess (no confidence intervals) or running and plotting versus analysis time.

Best wishes.

Enzo





***

I get the following error message after typing stgtcalc:
***
Data are st/Stata 6 and not st/Stata 5.
You are running the old Stata 5 version of st.
We provide it so that researchers may reproduce old analyses.
If you do not mean to be running the old system, type

       . version 6

if you do mean to be running the old system, type

       . version 5
       stset ...                       fill in the dots with old syntax)

When you are done, type

       . version 6
r(119);
***

I have tried
***
version 5:stset time trtt
version 5:stcox sex  agecateg2 agecateg3
version 5:stgtcalc
***

But I get exactly the same error message.
I don't know how to stset in stata5 but in his example, P. Royston and P
Sasieni use the same stset I have used. Is it the data I must change?
Otherwise, is there an adaptation of stgtcalc to stata9?
Thank you so much for your help
Valérie


        Valérie Jooste
        Registre des tumeurs digestives
        INSERM EMI 0106
        Recherche épidémiologique et clinique en cancérologie digestive
        Faculté de Médecine
        BP 87900
        21079 Dijon cedex
        FRANCE
        Tel : +33- 380 39 33 25
        Fax : +33- 380 66 82 51



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^^^^^^^^^^^^^^^^
Enzo Coviello
Dipartimento Prevenzione ASL BAT/1
Ufficio Igiene Pubblica
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