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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