ci.cor2.gen

Computes a 100(1 - alpha)% confidence interval for a difference in
population correlations in a 2-group design. The correlations can be
Pearson, Spearman, partial, semipartial, or point-biserial correlations.
The correlations could also be correlations between two latent factors.
The function requires a point estimate and a 100(1 - alpha)% confidence
interval for each correlation as input. The confidence intervals for
each correlation can be obtained using the ci.fisher function.

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.cor2.gen function

<dl><dt>cor1</dt>
<dd>estimated correlation for group 1</dd>
<dt>ll1</dt>
<dd>lower limit for group 1 correlation</dd>
<dt>ul1</dt>
<dd>upper limit for group 1 correlation</dd>
<dt>cor2</dt>
<dd>estimated correlation for group 2</dd>
<dt>ll2</dt>
<dd>lower limit for group 2 correlation</dd>
<dt>ul2</dt>
<dd>upper limit for group 2 correlation</dd></dl>

Arguments

Confidence interval for a 2-group correlation difference — ci.cor2.gen

<dl>

<dt>cor1</dt>
<dd>estimated correlation for group 1</dd>


<dt>ll1</dt>
<dd>lower limit for group 1 correlation</dd>


<dt>ul1</dt>
<dd>upper limit for group 1 correlation</dd>


<dt>cor2</dt>
<dd>estimated correlation for group 2</dd>


<dt>ll2</dt>
<dd>lower limit for group 2 correlation</dd>


<dt>ul2</dt>
<dd>upper limit for group 2 correlation</dd>

</dl>

ci.cor2.gen: Confidence interval for a 2-group correlation difference

Description

Usage

Value

Arguments

References

Examples