flexsurv (version 0.6)

Hazard and cumulative hazard functions for standard distributions: Hazard and cumulative hazard functions

Description

Hazard and cumulative hazard functions for distributions which are built into flexsurv, and whose distribution functions are in base R.

Usage

hexp(x, rate=1, log=FALSE)
Hexp(x, rate=1, log=FALSE)
hweibull (x, shape, scale = 1, log = FALSE) 
Hweibull (x, shape, scale = 1, log = FALSE) 
hgamma(x, shape, rate=1, log=FALSE)
Hgamma(x, shape, rate=1, log=FALSE)
hlnorm(x, meanlog=0, sdlog=1, log=FALSE)
Hlnorm(x, meanlog=0, sdlog=1, log=FALSE)

Arguments

x

Vector of quantiles

rate

Rate parameter (exponential and gamma)

shape

Shape parameter (Weibull and gamma)

scale

Scale parameter (Weibull)

meanlog

Mean on the log scale (log normal)

sdlog

Standard deviation on the log scale (log normal)

log

Compute log hazard or log cumulative hazard

Value

• Hazard (functions beginning 'h') or cumulative hazard (functions beginning 'H').

Details

For the exponential and the Weibull these are available analytically, and so are programmed here in numerically stable and efficient forms. For the gamma and log-normal, these are simply computed as minus the log of the survivor function (cumulative hazard) or the ratio of the density and survivor function (hazard), so are not expected to be robust to extreme values or quick to compute.

See Also

dexp,dweibull,dgamma,dlnorm,dgompertz,dgengamma,dgenf