survival (version 2.38-3)

agreg.fit: 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 advantagous 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)
coxph.fit(x, y, strata, offset, init, control, weights, method, rownames)

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 hanling 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.

Value

• a list containing results of the fit

Details

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

See Also

coxph