propind

Compute power for Tests of Two Independent Proportions
Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user

Statistical power analysis for designs including t-tests, correlations,
multiple regression, ANOVA, mediation, and logistic regression. Functions accompany
Aberson (2019) <doi:10.4324/9781315171500>.

Chris Aberson

pwr2ppl

Power Analyses for Common Designs (Power to the People)

propind function

<dl><dt>p1</dt>
<dd>expected proportion Group 1</dd>
<dt>p2</dt>
<dd>expected proportion Group 2</dd>
<dt>nlow</dt>
<dd>starting sample size</dd>
<dt>nhigh</dt>
<dd>ending sample size</dd>
<dt>nratio</dt>
<dd>ratio of sample size of first group to second (default is .5 for equally sized groups)</dd>
<dt>alpha</dt>
<dd>Type I error (default is .05)</dd>
<dt>tails</dt>
<dd>number of tails for test (default is 2)</dd>
<dt>by</dt>
<dd>Incremental increase in sample (e.g. nlow = 10, nhigh = 24, by = 2, produces estimates of 10, 12, and 14)</dd></dl>

Arguments

Compute power for Tests of Two Independent Proportions
Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user — propind

<dl>

<dt>p1</dt>
<dd>expected proportion Group 1</dd>


<dt>p2</dt>
<dd>expected proportion Group 2</dd>


<dt>nlow</dt>
<dd>starting sample size</dd>


<dt>nhigh</dt>
<dd>ending sample size</dd>


<dt>nratio</dt>
<dd>ratio of sample size of first group to second (default is .5 for equally sized groups)</dd>


<dt>alpha</dt>
<dd>Type I error (default is .05)</dd>


<dt>tails</dt>
<dd>number of tails for test (default is 2)</dd>


<dt>by</dt>
<dd>Incremental increase in sample (e.g. nlow = 10, nhigh = 24, by = 2, produces estimates of 10, 12, and 14)</dd>

</dl>

Compute power for Tests of Two Independent Proportions
Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user

propind: Compute power for Tests of Two Independent Proportions Takes phi, degrees of freedom, and a range of sample sizes. Alpha is .05 by default, alternative values may be entered by user

Description

Usage

Value

Arguments

Examples