Description Usage Arguments Details Value Author(s)

This function is used internally by several survival routines. It computes a simple quadratic form, while properly dealing with missings.

1 | ```
coxph.wtest(var, b, toler.chol = 1e-09)
``` |

`var` |
variance matrix |

`b` |
vector |

`toler.chol` |
tolerance for the internal cholesky decomposition |

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.

a real number

Terry Therneau

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