RandEff_to_alpha012: Correlation structure: transform random effects to alpha

In SteppedPower: Power Calculation for Stepped Wedge Designs

Correlation structure: transform random effects to alpha

Description

Correlation structure: transform random effects to alpha

Usage

RandEff_to_alpha012(sigResid, tau, gamma, psi)

Arguments

sigResid	Residual standard deviation on individual leve
tau	standard deviation of random cluster intercept
gamma	standard deviation of random time effect
psi	standard deviation of random subject specific intercept

Value

a list containing four named elements (possibly matrices): 'alpha0', 'alpha1', 'alpha2' specify a correlation structure and SigMarg denotes the marginal standard deviation

Examples

RandEff_to_alpha012(sigResid=sqrt(11), tau=4, gamma=3, psi=2)

## The function is vectorised:
RandEff_to_alpha012(sigResid = matrix(c(0,1,2,3,4,5), 2, 3),
                    tau      = matrix(c(1,1,1,0,0,0), 2, 3),
                    gamma    = matrix(c(0,0,1,0,0,1), 2, 3),
                    psi      = matrix(c(0,1,1,0,0,1), 2, 3))

SteppedPower documentation built on Sept. 13, 2023, 1:07 a.m.