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.

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)
#>      Total sample size
#> [1,]               189

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