How can I get the Log - Rank p value to be output?
The chi square value can be output, so I was thinking if I can also have the
degrees of freedom output I could generate the p value, but can't see how to
find df either.
> (survtest <- survdiff(Surv(time, cens) ~ group, data = surv,rho=0))
Call:
survdiff(formula = Surv(time, cens) ~ group, data = surv, rho = 0)
N Observed Expected (O-E)^2/E (O-E)^2/V
group=1 20 16 11.0 2.23 4.64
group=2 20 12 17.0 1.45 4.64
Chisq= 4.6 on 1 degrees of freedom, p= 0.0312
> survtest$chisq
[1] 4.641028
> survtest$df
NULL
--
Murray Pung
Statistician, Datapharm Australia Pty Ltd
0404 273 283
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