size.test.mean.ps

Computes the sample size required to test a difference in population means
with desired power in a paired-samples design. Set the Pearson correlation
planning value to the smallest value within a plausible range, and set the
variance planning value to the largest value within a plausible range for a
conservatively large sample size.

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

size.test.mean.ps function

<dl><dt>alpha</dt>
<dd>alpha level for hypothesis test</dd>
<dt>pow</dt>
<dd>desired power</dd>
<dt>var</dt>
<dd>planning value of average variance of the two measurements</dd>
<dt>es</dt>
<dd>planning value of mean difference</dd>
<dt>cor</dt>
<dd>planning value of correlation</dd></dl>

Arguments

Sample size for a test of a paired-samples mean difference — size.test.mean.ps

<dl>

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


<dt>pow</dt>
<dd>desired power</dd>


<dt>var</dt>
<dd>planning value of average variance of the two measurements</dd>


<dt>es</dt>
<dd>planning value of mean difference</dd>


<dt>cor</dt>
<dd>planning value of correlation</dd>

</dl>

size.test.mean.ps: Sample size for a test of a paired-samples mean difference

Description

Usage

Value

Arguments

Examples