pphsm function

Parametric Proportional Hazards form of AFT Models

Parametric Proportional Hazards form of AFT Models

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).

pphsm(fit) ## S3 method for class 'pphsm' print(x, digits=max(options()$digits - 4, 3), correlation=TRUE, ...) ## S3 method for class 'pphsm' vcov(object, ...)

Arguments

  • fit: fit object created by psm
  • x: result of psm
  • digits: how many significant digits are to be used for the returned value
  • correlation: set to FALSE to suppress printing of correlation matrix of parameter estimates
  • ...: ignored
  • object: a pphsm object

Returns

a new fit object with transformed parameter estimates

Author(s)

Frank Harrell

Department of Biostatistics

Vanderbilt University

fh@fharrell.com

See Also

psm, summary.rms, print.pphsm

Examples

require(survival) 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) ## Not run: summary(f.ph) # effects on hazard ratio scale options(datadist=NULL)
  • Maintainer: Frank E Harrell Jr
  • License: GPL (>= 2)
  • Last published: 2025-01-17