chisq.indep

Performs power and sample size calculations for a chi-square test of independence.
The user inputs a matrix of cell probabilities for a two-way table. The function computes
the power (or required total sample size) for a test of no association between the two factors.

Power and sample size calculations for a variety of study designs and
outcomes. Methods include t tests, ANOVA (including tests for interactions,
simple effects and contrasts), proportions, categorical data (chi-square tests
and proportional odds), linear, logistic and Poisson regression, alternative
and coprimary endpoints, power for confidence intervals, correlation
coefficient tests, cluster randomized trials, individually randomized group
treatment trials, multisite trials, treatment-by-covariate interaction effects
and nonparametric tests of location. Utilities are provided for
computing various effect sizes. Companion package to the book
"Power and Sample Size in R", Crespi (2025, ISBN:9781138591622).
Further resources available at <https://powerandsamplesize.org/>.

Catherine M. Crespi

powertools

Power and Sample Size Tools

Zichen Liu

Kristen M. McGreevy

chisq.indep function

<dl><dt>pmatrix</dt>
<dd>The two-way probability table under the alternative hypothesis. The probabilities must sum to 1.</dd>
<dt>N</dt>
<dd>The total number of observations.</dd>
<dt>alpha</dt>
<dd>The significance level (type 1 error rate); defaults to 0.05.</dd>
<dt>power</dt>
<dd>The specified level of power.</dd>
<dt>v</dt>
<dd>Either TRUE for verbose output or FALSE (default) to output computed argument only.</dd></dl>

Arguments

Power calculation for chi-square test of independence — chisq.indep

<dl>

<dt>pmatrix</dt>
<dd>The two-way probability table under the alternative hypothesis. The probabilities must sum to 1.</dd>


<dt>N</dt>
<dd>The total number of observations.</dd>


<dt>alpha</dt>
<dd>The significance level (type 1 error rate); defaults to 0.05.</dd>


<dt>power</dt>
<dd>The specified level of power.</dd>


<dt>v</dt>
<dd>Either TRUE for verbose output or FALSE (default) to output computed argument only.</dd>

</dl>

chisq.indep: Power calculation for chi-square test of independence

Description

Usage

Value

Arguments

Examples