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kalbfleisch
2010 Nov 15
1
interpretation of coefficients in survreg AND obtaining the hazard function
...different ways to parameterize a Weibull
distribution, 1-4 appear in various texts and the acf form is #5. This
is a second common issue with survreg that strikes only the more
sophisticated users: to understand the output they look up the Weibull
in a textbook, and become even more confused!
Kalbfliesch and Prentice is a good reference for the acf form. The
manual page for psurvreg has some information on this, as does the very
end of ?survreg. The psurvreg page also has an example of how to
extract the hazard function for a Weibull fit.
----Begin included message ----
Dear R help list,
I am...
2009 Aug 01
1
about the summary(cph.object)
Could someone explain the summary(cph.object)?
The example is in the help file of cph.
n <- 1000
set.seed(731)
age <- 50 + 12*rnorm(n)
label(age) <- "Age"
sex <- factor(sample(c('Male','Female'), n,
rep=TRUE, prob=c(.6, .4)))
cens <- 15*runif(n)
h <- .02*exp(.04*(age-50)+.8*(sex=='Female'))
dt <- -log(runif(n))/h
label(dt)