get_letters

Gets the letter matrix for a compact letter display. This can be passed to the <code>letter_plot()</code> function from the <code>psre</code> package to produce plots of
confidence intervals with a letter display.

Identifies the optimal confidence level to represent the results of a set of pairwise tests as suggested by Armstrong and Poirier (2025) <doi:10.1017/pan.2024.24>.

Dave Armstrong

VizTest

Optimal Confidence Intervals for Visual Testing

William Poirier

get_letters function

<dl><dt>x</dt>
<dd>An object that can be one of the following classes: an object of class <code>glht</code> produced by <code>glht()</code> from the <code>multcomp</code> package,
an object of class <code>emmGrid</code> produced by the <code>emmeans</code> package, or a list with elements <code>est</code> - a vector of estimates and <code>var</code> - a variance-covariance matrix for the estimates.</dd>
<dt>...</dt>
<dd>Additional arguments passed down either to <code>cld</code> if the object is an <code>emmGrid</code> class or <code>summary.glht</code> if the object is a <code>glht</code> class.
If <code>x</code> is a list of estimates and variances, it will be converted to an <code>emmGrid</code> object internally and the <code>emmGrid</code> method dispatched,
<code>...</code> will be passed to <code>cld</code> in that case. Additional arguments for the <code>summary.glht()</code> include <code>test</code> and a host of others. See the help file for <code>summary.glht</code> for examples.
Additional arguments for <code>cld</code> include <code>adjust</code> for multiplicity corrections and others. See <code>?emmeans:::cld.emmGrid</code> for options and details.</dd></dl>

Arguments

Get Letters for Multiple Comparisons — get_letters

<dl>

<dt>x</dt>
<dd>An object that can be one of the following classes: an object of class <code>glht</code> produced by <code>glht()</code> from the <code>multcomp</code> package,
an object of class <code>emmGrid</code> produced by the <code>emmeans</code> package, or a list with elements <code>est</code> - a vector of estimates and <code>var</code> - a variance-covariance matrix for the estimates.</dd>


<dt>...</dt>
<dd>Additional arguments passed down either to <code>cld</code> if the object is an <code>emmGrid</code> class or <code>summary.glht</code> if the object is a <code>glht</code> class.
If <code>x</code> is a list of estimates and variances, it will be converted to an <code>emmGrid</code> object internally and the <code>emmGrid</code> method dispatched,
<code>...</code> will be passed to <code>cld</code> in that case. Additional arguments for the <code>summary.glht()</code> include <code>test</code> and a host of others. See the help file for <code>summary.glht</code> for examples.
Additional arguments for <code>cld</code> include <code>adjust</code> for multiplicity corrections and others. See <code>?emmeans:::cld.emmGrid</code> for options and details.</dd>

</dl>

get_letters: Get Letters for Multiple Comparisons

Description

Usage

Value

Arguments