[R] p-value from survreg(), library(survival)
marc_schwartz at comcast.net
Wed Jul 11 16:34:47 CEST 2007
Actually, in this case, looking at the code for:
would be better, as the p value is calculate there, rather than being
part of the survreg object. As with many R functions, the p value is
calculated in the print method for the object.
In this case, it is a pretty straightforward p value for the chi-square
statistic. Using the output of Vlado's example below:
> format(signif(1 - pchisq(11.39, 1), 2))
On Wed, 2007-07-11 at 16:11 +0200, hadley wickham wrote:
> str(survreg(s~groups, dist="gaussian"))
> is probably a good place to start.
> On 7/11/07, Vlado Sremac <vladosr at gmail.com> wrote:
> > dear r experts:
> > It seems my message got spam filtered, another try:
> > i would appreciate advice on how to get the p-value from the object 'sr'
> > created with the function survreg() as given below.
> > vlad
> > sr<-survreg(s~groups, dist="gaussian")
> > Coefficients:
> > (Intercept) groups
> > -0.02138485 0.03868351
> > Scale= 0.01789372
> > Loglik(model)= 31.1 Loglik(intercept only)= 25.4
> > Chisq= 11.39 on 1 degrees of freedom, p= 0.00074
> > n= 16
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