agreg.fit: Cox model fitting functions

In survival: Survival Analysis

Cox model fitting functions

Description

These are the the functions called by coxph that do the actual computation. In certain situations, e.g. a simulation, it may be advantageous to call these directly rather than the usual coxph call using a model formula.

Usage

agreg.fit(x, y, strata, offset, init, control, weights, method,
rownames, resid=TRUE, nocenter=NULL)
coxph.fit(x, y, strata, offset, init, control, weights, method,
rownames, resid=TRUE, nocenter=NULL)

Arguments

x	Matix of predictors. This should not include an intercept.
y	a Surv object containing either 2 columns (coxph.fit) or 3 columns (agreg.fit).
strata	a vector containing the stratification, or NULL
offset	optional offset vector
init	initial values for the coefficients
control	the result of a call to coxph.control
weights	optional vector of weights
method	method for handling ties, one of "breslow" or "efron"
rownames	this is only needed for a NULL model, in which case it contains the rownames (if any) of the original data.
resid	compute and return residuals.
nocenter	an optional list of values. Any column of the X matrix whose values lie strictly within that set will not be recentered. Note that the coxph function has (-1, 0, 1) as the default.

Details

This routine does no checking that arguments are the proper length or type. Only use it if you know what you are doing!

The resid and concordance arguments will save some compute time for calling routines that only need the likelihood, the generation of a permutation distribution for instance.

Value

a list containing results of the fit

Author(s)

Terry Therneau

See Also

coxph

survival documentation built on June 22, 2024, 10:49 a.m.