size.interval.cor: Sample size for an interval test of a Pearson or partial...

In statpsych: Statistical Methods for Psychologists

Sample size for an interval test of a Pearson or partial correlation

Description

Computes the sample size required to perform an interval test for a population Pearson or a partial correlation with desired power where the interval midpoint is equal to zero. This function can be used to plan a study where the goal is to show that the population correlation is small. Set s = 0 for a Pearson correlation. The correlation planning value must be a value within the hypothesized interval.

For more details, see Section 1.25 of Bonett (2021, Volume 2)

Usage

size.interval.cor(alpha, pow, cor, s, h)

Arguments

alpha	alpha level for hypothesis test
pow	desired power
cor	planning value of correlation
s	number of control variables
h	upper limit of hypothesized interval

Value

Returns the required sample size

References

\insertRef

Bonett2021statpsych

Examples

size.interval.cor(.05, .9, .1, 0, .3)

# Should return:
# Sample size
#         251
 

statpsych documentation built on Jan. 13, 2026, 1:07 a.m.