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Re: st: Order of variables in stcox model
From
Steven Samuels <[email protected]>
To
[email protected]
Subject
Re: st: Order of variables in stcox model
Date
Sat, 13 Aug 2011 22:53:49 -0400
As Sarah has stated this shouldn't happen. I suggest that you send the data set and do file to technical support ([email protected]). I don't think there's anything more we can do here.
Steve
On Aug 12, 2011, at 12:51 PM, Brigham Whitman wrote:
Hello. I am building a model using stcox in Stata 9.2.
My question is: How should I order the variables that I put in the
model? I get different results depending on how the variables are
ordered. For example:
xi: stcox velocity roads snow i.season, nohr strata(sex age) robust
will produce different results than:
xi: stcox roads snow velocity i.season, nohr strata(sex age) robust
To be completely transparent: with my data, sometimes the order of the
variables does not matter for smaller models (less than 4 variables).
But with larger models (more than 6 variables), the results do change
when the order of the variables is changed.
What is the importance of the order of the variables (in this case,
roads, snow, velocity, and i.season) in the model?
Thank you,
Brigham Whitman
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