size.interval.cor

Computes the sample size required to perform an interval test for a
population Pearson or a partial correlation with desired power where the
interval midpoint is equal to zero. This function can be used to plan a study
where the goal is to show that the population correlation is small. Set s = 0
for a Pearson correlation. The correlation planning value must be a value
within the hypothesized interval.

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.interval.cor function

<dl><dt>alpha</dt>
<dd>alpha level for hypothesis test</dd>
<dt>pow</dt>
<dd>desired power</dd>
<dt>cor</dt>
<dd>planning value of correlation</dd>
<dt>s</dt>
<dd>number of control variables</dd>
<dt>h</dt>
<dd>upper limit of hypothesized interval</dd></dl>

Arguments

Sample size for an interval test of a Pearson or partial correlation — size.interval.cor

<dl>

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


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


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


<dt>s</dt>
<dd>number of control variables</dd>


<dt>h</dt>
<dd>upper limit of hypothesized interval</dd>

</dl>

size.interval.cor: Sample size for an interval test of a Pearson or partial correlation

Description

Usage

Value

Arguments

Examples