ci.mean.ps

Computes a confidence interval for a population paired-samples mean
difference using the estimated means, estimated standard deviations,
estimated correlation, and sample size. Also computes a paired-samples
t-test. Use the t.test function for raw data input.

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

ci.mean.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 between measurements</dd>
<dt>n</dt>
<dd>sample size</dd></dl>

Arguments

Confidence interval for a paired-samples mean difference — ci.mean.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 between measurements</dd>


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

</dl>

ci.mean.ps: Confidence interval for a paired-samples mean difference

Description

Usage

Value

Arguments

Examples