This is how you go about doing this.
summary(results)$coefficients[1,5]
You will have to check this for you code. But the idea is that
summary(results) is a list (?) and one of its components is called
coefficients, which is a matrix. So the problem is just to extract
one element of this matrix.
I am not well versed with coxph so there may be some minor details I
am missing, but that is the general idea (same as with lm, glm etc.).
Ritwik.
On 9/30/06, Boks, M.P.M. [EMAIL PROTECTED] wrote:
Dear R users,
I am calculating several cox proportional hazard models after each other (I
know this is unusual, but I am just exploring the data). For the purpose of
multiple testing correction I need to construct an array of these p-values.
However since the output is not an array in itself, I cannot find a way to
obtain the p-value only.
attach(tms)
goal-rep(0.7*FREQUENC[1:13],6)
event- Surv(TIJD,FREQUENCgoal)
results-coxph(event~ TYPETREA)
summary(results)
Call:
coxph(formula = event ~ TYPETREA)
n=76 (2 observations deleted due to missing)
coef exp(coef) se(coef) z p
TYPETREAnon-guided -0.826 0.4380.484 -1.71 0.088
exp(coef) exp(-coef) lower .95 upper .95
TYPETREAnon-guided 0.438 2.28 0.169 1.13
Rsquare= 0.041 (max possible= 0.829 )
Likelihood ratio test= 3.2 on 1 df, p=0.0737
Wald test= 2.91 on 1 df, p=0.088
Score (logrank) test = 3.08 on 1 df, p=0.0794
Does anyone now how to extract the p-value?
Many thanks!,
Marco
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--
Ritwik Sinha
Graduate Student
Epidemiology and Biostatistics
Case Western Reserve University
[EMAIL PROTECTED] | +12163682366 | http://darwin.cwru.edu/~rsinha
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