ci.lc.mean.scheffe

Computes a Scheffe confidence interval for a linear contrast of population
means in a between-subjects design. A Scheffe p-value is computed for the
test statistic. The Scheffe method assumes equal population variances. This
function is useful in exploratory studies where the linear contrast of
means was not planned but was suggested by the pattern of sample means. Use
the ci.lc.mean.bs function with a Bonferroni adjusted alpha
value to compute simultaneous confidence intervals for two or more planned
linear contrasts of means.

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.lc.mean.scheffe function

<dl><dt>alpha</dt>
<dd>alpha level for 1-alpha confidence</dd>
<dt>m</dt>
<dd>vector of estimated group means</dd>
<dt>sd</dt>
<dd>vector of estimated group standard deviations</dd>
<dt>n</dt>
<dd>vector of sample sizes</dd>
<dt>v</dt>
<dd>vector of between-subjects contrast coefficients</dd></dl>

Arguments

Scheffe confidence interval for a linear contrast of means in a
between-subjects design — ci.lc.mean.scheffe

<dl>

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


<dt>m</dt>
<dd>vector of estimated group means</dd>


<dt>sd</dt>
<dd>vector of estimated group standard deviations</dd>


<dt>n</dt>
<dd>vector of sample sizes</dd>


<dt>v</dt>
<dd>vector of between-subjects contrast coefficients</dd>

</dl>

ci.lc.mean.scheffe: Scheffe confidence interval for a linear contrast of means in a between-subjects design

Description

Usage

Value

Arguments

References

Examples