pi.score.ps

For a 2-level within-subjects experiment, this function computes a
prediction interval for how the response variable score for one randomly
selected person from the study population would differ under the two
treatment conditions.

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

pi.score.ps function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>m1</dt>
<dd>estimated mean for measurement 1</dd>
<dt>m2</dt>
<dd>estimated mean for measurement 2</dd>
<dt>sd1</dt>
<dd>estimated standard deviation for measurement 1</dd>
<dt>sd2</dt>
<dd>estimated standard deviation for measurement 2</dd>
<dt>cor</dt>
<dd>estimated correlation of paired scores</dd>
<dt>n</dt>
<dd>sample size</dd></dl>

Arguments

Prediction interval for difference of scores in a 2-level within-subjects
experiment — pi.score.ps

<dl>

<dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>


<dt>m1</dt>
<dd>estimated mean for measurement 1</dd>


<dt>m2</dt>
<dd>estimated mean for measurement 2</dd>


<dt>sd1</dt>
<dd>estimated standard deviation for measurement 1</dd>


<dt>sd2</dt>
<dd>estimated standard deviation for measurement 2</dd>


<dt>cor</dt>
<dd>estimated correlation of paired scores</dd>


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

</dl>

pi.score.ps: Prediction interval for difference of scores in a 2-level within-subjects experiment

Description

Usage

Value

Arguments

Examples