# Power and Sample Size Calculation for the Cochran-Mantel-Haenszel Test

Calculates the power and sample size for Cochran-Mantel-Haenszel tests. There are also several helper functions for working with probability, odds, relative risk, and odds ratio values.

# samplesizeCMH: Sample Size Calculation for the Cochran-Mantel-Haenszel Test

by Paul W. Egeler M.S. This package provides functions relating to power and sample size calculation for the CMH test. There are also several helper functions for interconverting probability, odds, relative risk, and odds ratio values.

### The Cochran Mantel Haenszel Test

The Cochran-Mantel-Haenszel test (CMH) is an inferential test for the association between two binary variables, while controlling for a third confounding nominal variable. Two variables of interest, X and Y, are compared at each level of the confounder variable Z and the results are combined, creating a common odds ratio. Essentially, the CMH test examines the weighted association of X and Y. The CMH test is a common technique in the field of biostatistics, where it is often used for case-control studies.

### Sample Size Calculation

Given a target power which the researcher would like to achieve, a calculation can be performed in order to estimate the appropriate number of subjects for a study. The `power.cmh.test` function calculates the required number of subjects per group to achieve a specified power for a Cochran-Mantel-Haenszel test.

### Power Calculation

Researchers interested in estimating the probability of detecting a true positive result from an inferential test must perform a power calculation using a known sample size, effect size, significance level, et cetera. The `power.cmh.test` function can compute the power of a CMH test, given parameters from the experiment.

## Installation

Downloading and installing the package from GitHub is facilitated by `devtools`. To do so, type the following into your R console:

``````install.packages("devtools")
devtools::install_github("pegeler/samplesizeCMH")
``````

# Reference manual

install.packages("samplesizeCMH")

0.0.0 by Paul Egeler, 4 years ago

https://github.com/pegeler/samplesizeCMH

Report a bug at https://github.com/pegeler/samplesizeCMH/issues

Browse source code at https://github.com/cran/samplesizeCMH

Authors: Paul Egeler [aut, cre] , Spectrum Health , Grand Rapids , MI [cph]

Documentation:   PDF Manual