anova1way.c.bal: Power calculation for one-way balanced analysis of variance...

In powertools: Power and Sample Size Tools

Power calculation for one-way balanced analysis of variance contrast test

Description

Performs sample size and power calculations for a test of a contrast in a one-way ANOVA with balanced data (that is, equal sized groups). Can be used to solve for power, n (sample size per group), or alpha. For unbalanced data, see anova1way.c.unbal.

Usage

anova1way.c.bal(
  n = NULL,
  mvec = NULL,
  cvec = NULL,
  sd = 1,
  Rsq = 0,
  ncov = 0,
  alpha = 0.05,
  power = NULL,
  v = FALSE
)

Arguments

n	The sample size per group.
mvec	A vector of group means c(mu1, mu2, ...).
cvec	A vector of contrast coefficients c(c1, c2, ...).
sd	The estimated standard deviation within each group; defaults to 1.
Rsq	The estimated R^2 for regressing the outcome on the covariates; defaults to 0.
ncov	The number of covariates adjusted for in the model; defaults to 0.
alpha	The significance level (type 1 error rate); defaults to 0.05.
power	The specified level of power.
v	Either TRUE for verbose output or FALSE (default) to output computed argument only.

Value

A list of the arguments (including the computed one).

Examples

anova1way.c.bal(n = 20, mvec = c(5, 10, 12), cvec = c(1, -1, 0), sd = 10, alpha = 0.025)
anova1way.c.bal(n = 20, mvec = c(5, 10, 12), cvec = c(1, 0, -1), sd = 10, alpha = 0.025)

powertools documentation built on April 4, 2025, 5:02 a.m.