hazard: Hazard and cumulative hazard functions

In flexsurv: Flexible Parametric Survival and Multi-State Models

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)

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)

hweibull(x, shape, scale = 1, log = FALSE)

Hweibull(x, shape, scale = 1, log = FALSE)

Arguments

x	Vector of quantiles
rate	Rate parameter (exponential and gamma)
log	Compute log hazard or log cumulative hazard
shape	Shape parameter (Weibull and gamma)
meanlog	Mean on the log scale (log normal)
sdlog	Standard deviation on the log scale (log normal)
scale	Scale parameter (Weibull)

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.

Value

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

Author(s)

Christopher Jackson <[e-mail]>

See Also

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

flexsurv documentation built on Sept. 12, 2024, 7:23 a.m.