ci.stdmean.strat

Computes confidence intervals for a population standardized mean difference
in a 2-group nonexperimental design with stratified random sampling (a random
sample of a specified size from each subpopulation) using a square root
weighted variance standardizer or single group standard deviation
standardizer. Equality of variances is not assumed.

Implements confidence interval and sample size methods that are especially
useful in psychological research but are also useful in educational, social science,
business, and biological research. This package includes more than 100 confidence
interval functions and more than 80 sample size functions for 1-group, 2-group,
paired-samples, and multiple-group designs and for a variety of parameters including
means, medians, proportions, slopes, standardized mean differences, standardized
linear contrasts of means, and several measures of correlation and association. 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 about these methods 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.stdmean.strat 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>
<dt>p1</dt>
<dd>proportion of total population in subpopulation 1</dd></dl>

Arguments

Confidence intervals for a 2-group standardized mean difference with
stratified sampling — ci.stdmean.strat

<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>


<dt>p1</dt>
<dd>proportion of total population in subpopulation 1</dd>

</dl>

ci.stdmean.strat: Confidence intervals for a 2-group standardized mean difference with stratified sampling

Description

Usage

Value

Arguments

References

Examples