ci.stdmean2

Computes confidence intervals for a population standardized mean difference.
Unweighted, weighted, and single group variance standardizers are used. The
square root weighted variance standardizer is recommended in 2-group
nonexperimental designs with simple random sampling. The square root
unweighted variance standardizer is recommended in 2-group experimental
designs. The single group standard deviation standardizer can be used with
experimental or nonexperimental designs. Equality of variances is not
assumed.

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.stdmean2 function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>m1</dt>
<dd>estimated mean for group 1</dd>
<dt>m2</dt>
<dd>estimated mean for group 2</dd>
<dt>sd1</dt>
<dd>estimated standard deviation for group 1</dd>
<dt>sd2</dt>
<dd>estimated standard deviation for group 2</dd>
<dt>n1</dt>
<dd>sample size for group 1</dd>
<dt>n2</dt>
<dd>sample size for group 2</dd></dl>

Arguments

Confidence intervals for a 2-group standardized mean difference — ci.stdmean2

<dl>

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


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


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


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


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


<dt>n1</dt>
<dd>sample size for group 1</dd>


<dt>n2</dt>
<dd>sample size for group 2</dd>

</dl>

ci.stdmean2: Confidence intervals for a 2-group standardized mean difference

Description

Usage

Value

Arguments

References

Examples