vcov.mpr: Extracting variance-covariance matrix for MPR models.

Description Usage Arguments Value Author(s) See Also Examples

Description

This function extracts the variance-covariance matrix for the estimated parameters from a fitted mpr model.

Usage

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## S3 method for class 'mpr'
vcov(object, ...)

Arguments

object

fitted mpr model.

...

further arguments passed to or from other methods.

Value

The variance-covariance matrix.

Author(s)

Kevin Burke.

See Also

mpr.

Examples

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# Veterans' administration lung cancer data
data(veteran, package="survival")
head(veteran)

mod1 <- mpr(Surv(time, status) ~ list(~ trt, ~ trt), data=veteran, family="Weibull")
vcov(mod1)
mod1$vcov


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