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st: Margins command after Cox regression
From
Fred Wolfe <[email protected]>
To
[email protected]
Subject
st: Margins command after Cox regression
Date
Fri, 30 Dec 2011 06:46:58 -0600
I am trying to get margins expressed in probability units rather than
hazard ratios after Cox regression (Stata 12).
My command and output are:
. stcox ib6.dxn age i.sex
failure _d: vzoster
analysis time _t: _ndbtime
id: patkey
Cox regression -- Breslow method for ties
No. of subjects = 31783 Number of obs = 203726
No. of failures = 1670
Time at risk = 112866
LR chi2(4) = 92.54
Log likelihood = -15665.104 Prob > chi2 = 0.0000
------------------------------------------------------------------------------
_t | Haz. Ratio Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
dxngroup |
2 | 2.675133 .3139785 8.38 0.000 2.125399 3.367056
4 | 1.368017 .1075621 3.99 0.000 1.17264 1.595946
|
age | 1.01012 .0020599 4.94 0.000 1.006091 1.014166
1.sex | .7660175 .0510103 -4.00 0.000 .6722888 .8728135
------------------------------------------------------------------------------
margins dxn, at(age=(20 30 40 50 60 70 80))
marginsplot
(output omitted)
Any suggestion on how to do this?
Thanks,
Fred
Fred Wolfe
National Data Bank for Rheumatic Diseases
Wichita, Kansas
NDB Office +1 316 263 2125 Ext 0
Research Office +1 316 686 9195
[email protected]
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