powerMSCRT: powerMSCRT

In bangtle/PowerRTCRT: Calculates the power for Randomized Trials (RT) and Cluster Randomized Trials (CRT) models.

Description

This function returns the power for multi-site cluster randomized trials designs with treatment at level 2 (cluster level). It addresses the following models:

• Main treatment effects (assuming random site effects) with no additional covariates.

• Main treatment effects (assuming random site effects) with covariate(s) at level 1 only.

• Main treatment effects (assuming random site effects) with covariate(s) at level 2 only.

• Main treatment effects (assuming random site effects) with covariate(s) at levels 1 and 2.

• Main treatment effects (assuming fixed site effects) with no additional covariates.

• Main treatment effects (assuming fixed site effects) with covariate(s) at level 1 only.

• Main treatment effects (assuming fixed site effects) with covariate(s) at level 2 only.

• Main treatment effects (assuming fixed site effects) with covariate(s) at levels 1 and 2.

Usage

powerMSCRT(n, J, K, delta, sigmad, rhoL2, rhoL3, numcovL1 = 0, numcovL2 = 0,
  R2L1 = 0, R2L2 = 0, randeff = TRUE, alpha = 0.05)

Arguments

n	Number of subjects in level 1 (individual level).
J	Number of units in level 2 (cluster level).
K	Number of units in level 3 (site level).
delta	Standardized effect size.
sigmad	Variance in treatment effects across sites.
rhoL2	Intraclass correlation (ICC) at level 2.
rhoL3	Intraclass correlation (ICC) at level 3.
numcovL1	Number of covariate(s) at level 1. Default value is 0.
numcovL2	Number of covariate(s) at level 2. Default value is 0.
R2L1	R-squared at level 1. Default value is 0.
R2L2	R-squared at level 2. Default value is 0.
randeff	Random site effects. Default value is FALSE.
alpha	Probability of type I error. Default value is 0.05.

See Also

PowerUpR

Examples

# All arguments are specified
powerMSCRT(n=100,J=40,K=40,delta=0.2,sigmad=0.2,rhoL2=0.3,rhoL3=0.2,numcovL1=1,numcovL2=1,R2L1=0.2,R2L2=0.30,randeff=TRUE,alpha=0.05)

# Unspecified arguments take their default values
powerMSCRT(n=100,J=40,K=40,delta=0.2,sigmad=0.2,rhoL2=0.3,rhoL3=0.2)

bangtle/PowerRTCRT documentation built on May 11, 2019, 6:19 p.m.