Parametric Proportional Hazards form of AFT Models

DESCRIPTION:

Translates an accelerated failure time (AFT) model fitted by psm to proportional hazards form, if the fitted model was a Weibull or exponential model (extreme value distribution with "log" link).

USAGE:

pphsm(fit)
## S3 method for class 'pphsm':
print(x, correlation=TRUE, ...)

ARGUMENTS:

fit
fit object created by psm
x
result of psm
correlation
set to FALSE to suppress printing of correlation matrix of parameter estimates
...
ignored

VALUE:

a new fit object with transformed parameter estimates

AUTHOR(S):

Frank Harrell
Department of Biostatistics
Vanderbilt University
f.harrell@vanderbilt.edu

SEE ALSO:

, ,

EXAMPLES:

set.seed(1)
S <- Surv(runif(100))
x <- runif(100)
dd <- datadist(x); options(datadist='dd')
f <- psm(S ~ x, dist="exponential")
summary(f)        # effects on log(T) scale
f.ph <- pphsm(f)
summary(f.ph)     # effects on hazard ratio scale
options(datadist=NULL)