size.ci.etasqr: Sample size for an eta-squared confidence interval

In statpsych: Statistical Methods for Psychologists

Sample size for an eta-squared confidence interval

Description

Computes the sample size required to estimate an eta-squared coefficient in a one-way ANOVA with desired confidence interval precision. Set the planning value of eta-squared to 1/3 for a conservatively large sample size.

Usage

size.ci.etasqr(alpha, etasqr, groups, w)

Arguments

alpha	alpha level for 1-alpha confidence
etasqr	planning value of squared multiple correlation
groups	number of groups
w	desired confidence interval width

Value

Returns the total sample size requirement

Examples

size.ci.etasqr(.05, .333, 3, .2)

# Should return:
#      Total sample size
# [1,]               189
 

statpsych documentation built on July 9, 2023, 6:50 p.m.