sample_size_prop: Sample Size for Multiple Proportions in One-Way Design

In TalhoukLab/biostatUtil: Utility Functions Used in Biostatistics Projects

Sample Size for Multiple Proportions in One-Way Design

Description

Calculates power and sample size in a one-way design for differences among response proportions of those groups.

Usage

sample_size_prop(props, power = NULL, n = NULL, alpha = 0.05)

Arguments

props	response proportion in each group
power	desired power
n	sample size in each group
alpha	significance level

Details

Specify exactly one of power or n in order to determine the value of the other unspecified parameter.

References

https://www.ncss.com/wp-content/themes/ncss/pdf/Procedures/PASS/Tests_for_Multiple_Proportions_in_a_One-Way_Design.pdf

Examples

## Examples from PASS Sample Size Software reference
# Example 1
sample_size_prop(props = c(0.4, 0.2, 0.2), n = 20)
sample_size_prop(props = c(0.4, 0.2, 0.2), n = 40)
sample_size_prop(props = c(0.4, 0.2, 0.2), n = 60)
sample_size_prop(props = c(0.4, 0.2, 0.2), n = 80)
sample_size_prop(props = c(0.4, 0.2, 0.2), n = 100)

# Example 2
sample_size_prop(props = c(0.4, 0.2, 0.2), power = 0.8)
sample_size_prop(props = c(0.4, 0.2, 0.2), power = 0.9)

# Example 3
sample_size_prop(power = 0.9, props = c(0.4, 0.1, 0.1))
sample_size_prop(power = 0.9001, props = c(0.4, 0.2, 0.2))
sample_size_prop(power = 0.9004, props = c(0.4, 0.3, 0.3))
sample_size_prop(power = 0.9038, props = c(0.4, 0.3, 0.1))

# Example 4
sample_size_prop(props = c(0.475, 0.2, 0.2, 0.2), n = 25)

TalhoukLab/biostatUtil documentation built on April 14, 2025, 4:15 a.m.