| coxph.wtest {survival} | R Documentation |
Compute a quadratic form
Description
This function is used internally by several survival routines. It computes a simple quadratic form, while properly dealing with missings.
Usage
coxph.wtest(var, b, toler.chol = 1e-09)
Arguments
var |
variance matrix |
b |
vector |
toler.chol |
tolerance for the internal cholesky decomposition |
Details
Compute b' V-inverse b. Equivalent to sum(b * solve(V,b)), except for the case of redundant covariates in the original model, which lead to NA values in V and b.
Value
a real number
Author(s)
Terry Therneau
[Package survival version 3.8-3 Index]