lmeBM: lmeBM

In covBM: Brownian Motion Processes for 'nlme'-Models

Description

This function is a wrapper for lme.formula that allows Brownian motion, fractional Brownian motion or integrated Ornstein-Uhlenbeck components to be included in linear mixed models, with related parameter estimates and confidence intervals returned in their natural parameterisation.

Usage

lmeBM(fixed, data, random, covariance = NULL, method = c("REML", "ML"),
  control = list(), keep.data = TRUE)

Arguments

fixed	This is as specified for lme.formula.
data	This is as specified for lme.formula.
random	This is as specified for lme.formula.
covariance	An optional corStruct object describing the within-group covariance structure. In addition to those available in nlme, covBM can be used to incorporate a Brownian motion component, covFracBM can be used to incorporate a fractional Brownian motion component and covIOU can be used to incorporate an integrated Ornstein-Uhlenbeck process in relation to a continuous variable.
method	This is as specified for lme.formula.
control	This is as specified for lme.formula.
keep.data	This is as specified for lme.formula.

Value

An object of class "lme" representing the linear mixed effects model fit.

Examples

BMmodel<-lmeBM(sqrtcd4~t, data=cd4, random=~t|newpid, covariance=covBM(form=~t|newpid),
							method="ML", control=list(opt="link{nlm}"))

Example output

Loading required package: nlme

covBM documentation built on May 1, 2019, 7:53 p.m.