extractBoot function

Extract Fixed and Random Bootstrapped Parameters

This generic function extracts the fixed and random components of bootstrapped estimates of an lqmm object.

extractBoot(object, which = "fixed")
## S3 method for class 'boot.lqmm'
extractBoot(object, which = "fixed")

Arguments

• object: an object of class boot.lqmm.
• which: character indicating whether "fixed" or "random" parameters.

Details

The "random" parameters refer to the "raw" parameters of the variance-covariance matrix of the random effects as returned by lqmm.fit.gs and lqmm.fit.df.

Returns

a matrix of bootstrapped estimates.

Author(s)

Marco Geraci

See Also

boot.lqmm, lqmm.fit.gs, lqmm.fit.df

Examples

## Orthodont data
data(Orthodont)

# Random intercept model
fit <- lqmm(distance ~ age, random = ~ 1, group = Subject,
        tau = 0.5, data = Orthodont)
fit.boot <- boot(fit)

# extract fixed effects
B <- extractBoot(fit.boot, which = "fixed")

# covariance matrix estimated fixed parameters
cov(B)