ci.spcor

Computes a Fisher confidence interval for a population semipartial
correlation. This function requires an (unadjusted) estimate of the
squared multiple correlation in the full model that contains the
predictor variable of interest plus all control variables. This
function computes a modified Aloe-Becker confidence interval that uses
n - 3 rather than n in the standard error and also uses a Fisher
transformation of the semipartial correlation.

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.spcor function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>cor</dt>
<dd>estimated semipartial correlation</dd>
<dt>r2</dt>
<dd>estimated squared multiple correlation in full model</dd>
<dt>n</dt>
<dd>sample size</dd></dl>

Arguments

Confidence interval for a semipartial correlation — ci.spcor

<dl>

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


<dt>cor</dt>
<dd>estimated semipartial correlation</dd>


<dt>r2</dt>
<dd>estimated squared multiple correlation in full model</dd>


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

</dl>

ci.spcor: Confidence interval for a semipartial correlation

Description

Usage

Value

Arguments

References

Examples