pc2p0

pc2p0_single

Given the output of <code>DeltaB2pc_cat3logit()</code> or
<code>DeltaB2pc_ord3logit()</code>, the coordinates of points on the
edge are computed for each curve of the field of points
given in input.

internal

An implementation of the ternary plot for interpreting regression
coefficients of trinomial regression models, as proposed in Santi, Dickson
and Espa (2019) <doi:10.1080/00031305.2018.1442368>. Ternary plots can be
drawn using either 'ggtern' package (based on 'ggplot2') or 'Ternary'
package (based on standard graphics). The package and its features are
illustrated in Santi, Dickson, Espa and Giuliani (2022)
<doi:10.18637/jss.v103.c01>.

Flavio Santi

plot3logit

Ternary Plots for Trinomial Regression Models

Maria Michela Dickson

Giuseppe Espa

Diego Giuliani

pc2p0 function

<dl><dt>pc</dt>
<dd><code>list</code> of ternary coordinates, as returned by
<code>DeltaB2pc_cat3logit()</code> or <code>DeltaB2pc_ord3logit()</code>.
Function <code>pc2p0_single</code> accepts only a single point
(that is a <code>numeric</code> vector of length three).</dd>
<dt>DeltaB</dt>
<dd>either a matrix \(\Delta^TB\in\textbf{R}^{1\times 2}\)
or a vector of length 2, if the model is categorical; otherwise
a matrix \(\Delta^TB\in\textbf{R}^{1\times 1}\) or a <code>numeric</code>,
if the model is ordinal.</dd>
<dt>edge</dt>
<dd>width of the border of the ternary plot.</dd>
<dt>flink</dt>
<dd>named <code>list</code> of two functions: <code>linkfun</code>
and <code>linkinv</code>. The former is the link function, whereas
the latter is its inverse.</dd></dl>

Arguments

Computation of starting points of curves of the field — pc2p0

<dl>

<dt>pc</dt>
<dd><code>list</code> of ternary coordinates, as returned by
<code>DeltaB2pc_cat3logit()</code> or <code>DeltaB2pc_ord3logit()</code>.
Function <code>pc2p0_single</code> accepts only a single point
(that is a <code>numeric</code> vector of length three).</dd>


<dt>DeltaB</dt>
<dd>either a matrix \(\Delta^TB\in\textbf{R}^{1\times 2}\)
or a vector of length 2, if the model is categorical; otherwise
a matrix \(\Delta^TB\in\textbf{R}^{1\times 1}\) or a <code>numeric</code>,
if the model is ordinal.</dd>


<dt>edge</dt>
<dd>width of the border of the ternary plot.</dd>


<dt>flink</dt>
<dd>named <code>list</code> of two functions: <code>linkfun</code>
and <code>linkinv</code>. The former is the link function, whereas
the latter is its inverse.</dd>

</dl>

pc2p0: Computation of starting points of curves of the field

Description

Usage

Value

Arguments