size.ci.lc.stdmean.ws

Computes the sample size required to estimate two types of standardized
linear contrasts of population means (unweighted standardizer and single
level standardizer) with desired confidence interval precision in a
within-subjects design. For a conservatively large sample size, set the
standardized linear contrast of means planning value to the largest value
within a plausible range, and set the Pearson correlation planning value
to the smallest value within a plausible range.
For more details, see Section 4.26 of Bonett (2021, Volume 1)

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

size.ci.lc.stdmean.ws function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>d</dt>
<dd>planning value of standardized linear contrast</dd>
<dt>cor</dt>
<dd>planning value of average correlation between measurements</dd>
<dt>w</dt>
<dd>desired confidence interval width</dd>
<dt>q</dt>
<dd>vector of within-subjects contrast coefficients</dd></dl>

Arguments

Sample size for a within-subjects standardized linear contrast of means
confidence interval — size.ci.lc.stdmean.ws

<dl>

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


<dt>d</dt>
<dd>planning value of standardized linear contrast</dd>


<dt>cor</dt>
<dd>planning value of average correlation between measurements</dd>


<dt>w</dt>
<dd>desired confidence interval width</dd>


<dt>q</dt>
<dd>vector of within-subjects contrast coefficients</dd>

</dl>

size.ci.lc.stdmean.ws: Sample size for a within-subjects standardized linear contrast of means confidence interval

Description

Usage

Value

Arguments

References

Examples