ci.ratio.mean2

Computes a confidence interval for a ratio of population means of
ratio-scale measurements in a 2-group design. 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.ratio.mean2 function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>y1</dt>
<dd>vector of scores for group 1</dd>
<dt>y2</dt>
<dd>vector of scores for group 2</dd></dl>

Arguments

Confidence interval for a 2-group mean ratio — ci.ratio.mean2

<dl>

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


<dt>y1</dt>
<dd>vector of scores for group 1</dd>


<dt>y2</dt>
<dd>vector of scores for group 2</dd>

</dl>

ci.ratio.mean2: Confidence interval for a 2-group mean ratio

Description

Usage

Value

Arguments

References

Examples