power.prop

Computes the approximate power of a one-sample proportion test for a
planned sample size. Set the proportion planning value to .5 for a
conservatively low power estimate. The value of the effect size need
not be based on the proportion planning value.

Implements confidence interval and sample size methods that
are especially useful in psychological research. The methods can be
applied in 1-group, 2-group, paired-samples, and multiple-group designs
and to a variety of parameters including means, medians, proportions,
slopes, standardized mean differences, standardized linear contrasts
of means, plus several measures of correlation and association.
Confidence interval and sample size functions are given for single
parameters as well as differences, ratios, and linear contrasts of
parameters. The sample size functions can be used to approximate the
sample size needed to estimate a parameter or function of parameters
with desired confidence interval precision or to perform a variety of
hypothesis tests (directional two-sided, equivalence, superiority,
noninferiority) with desired power. For details see: Statistical Methods
for Psychologists, Volumes 1 – 4, <https://dgbonett.sites.ucsc.edu/>.

Douglas G. Bonett

statpsych

Statistical Methods for Psychologists

Robert J. Calin-Jageman

power.prop function

<dl><dt>alpha</dt>
<dd>alpha level for hypothesis test</dd>
<dt>n</dt>
<dd>planned sample size</dd>
<dt>p</dt>
<dd>planning value of proportion</dd>
<dt>es</dt>
<dd>planning value of proportion minus null hypothesis value</dd></dl>

Arguments

Approximates the power of a 1-group proportion test for a planned sample
size — power.prop

<dl>

<dt>alpha</dt>
<dd>alpha level for hypothesis test</dd>


<dt>n</dt>
<dd>planned sample size</dd>


<dt>p</dt>
<dd>planning value of proportion</dd>


<dt>es</dt>
<dd>planning value of proportion minus null hypothesis value</dd>

</dl>

power.prop: Approximates the power of a 1-group proportion test for a planned sample size

Description

Usage

Value

Arguments

Examples