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Re: st: tabulate 'hazard ratios' and 'p values' after Cox analysis

From   Maarten Buis <>
Subject   Re: st: tabulate 'hazard ratios' and 'p values' after Cox analysis
Date   Tue, 24 Jul 2012 17:03:39 +0200

On Tue, Jul 24, 2012 at 4:46 PM, yaacov lawrence wrote:
> I am entering the results of a cox survival analysis into a matrix for
> further analysis.
> looking to tabulate 'hazard ratios' and 'p values', but these are not
> returned by ereturn.

*----------------- begin example ------------------
sysuse cancer, clear
stset studytime, failure(died)
tab drug, gen(d)
drop d1
stcox d? age

b = st_matrix("e(b)")
V = st_matrix("e(V)")

// hazard ratio
hr = exp(b)

// p-value
se = diagonal(cholesky(diag(V)))'
z = b:/se
p = 2*normal(-abs(z))

*---------------- end example -------------------

Also see:
M.L. Buis (2007), "Stata tip 54: Where did my p-values go?", The Stata
Journal, 7(4), pp.584-586.

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
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