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st: cubic spline


From   "Noori, Nazanin" <NNoori@labiomed.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: cubic spline
Date   Fri, 3 Jul 2009 09:37:31 -0700

Hi

I am writing you to ask you kindly help me in some issues.

I want to run a spline cubic to assess the spline models with 95% CI
reflecting mortality predictability of dietary phosphorus in a group.

I have two variables:

1-Death

2- Phosphorus intake

Would you please help me which syntax I should use? I want the Y axis to
show the Log hazard ratio and the X axis to show the dietary phosphorus.
Also I want to know if I want to adjust for age make second spline) what
should I do. So far I ran these syntaxes:


stset time to death, failure(death)

stcox Phosphorus intake

predict hr1, hr

generate lnhr = ln(hr1)



I really appreciate in advance

Best regard

Nazanin Noori   MD Ph.D
Harbor UCLA Medical Center



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