size.ci.oddsratio: Sample size for an odds ratio confidence interval

In statpsych: Statistical Methods for Psychologists

Sample size for an odds ratio confidence interval

Description

Computes the sample size required to estimate an odds ratio with desired confidence interval precision.

Usage

size.ci.oddsratio(alpha, p1, p2, or, r)

Arguments

alpha	alpha level for 1 - alpha confidence
p1	planning value for row 1 marginal proportion
p2	planning value for column 1 marginal proportion
or	planning value of odds ratio
r	desired upper to lower confidence interval endpoint ratio

Value

Returns the required sample size

Examples

size.ci.oddsratio(.05, .3, .2, 5.5, 3.0)

# Should return:
#  Sample size
#          356

statpsych documentation built on June 10, 2025, 5:11 p.m.