.get_reference_levels

Given a list of contrast matrices, if the contrast matrices were explicitly
generated via formulas and they have already had their parameters parsed, use
the parameters to look up the reference level for each contrast matrix. If
the parameters have not been computed (usually because the contrasts are
using the defaults) then look up the reference level manually.

internal

Quickly set and summarize contrasts for factors prior to regression analyses. Intended comparisons, baseline conditions, and intercepts can be explicitly set and documented without the user needing to directly manipulate matrices. Reviews and introductions for contrast coding are available in Brehm and Alday (2022)<doi:10.1016/j.jml.2022.104334> and Schad et al. (2020)<doi:10.1016/j.jml.2019.104038>.

Thomas Sostarics

contrastable

Consistent Contrast Coding for Factors

.get_reference_levels function

<dl><dt>contrast_list</dt>
<dd>List of contrasts, does not need to be named</dd>
<dt>list_params</dt>
<dd>Optional list of parameters, see <code>.make_parameters()</code>, if
NULL, then the reference level is determined from the contrast matrix
directly.</dd>
<dt>formulas</dt>
<dd>Optional list of formulas, needed if <code>params</code> are passed.
Used to get the correct environment for evaluating expressions in <code>params</code>.
If NULL, then the reference level is determiend from the contrast matrix
directly.</dd></dl>

Arguments

Get reference levels from a (possibly set) list of contrasts — .get_reference_levels

<dl>

<dt>contrast_list</dt>
<dd>List of contrasts, does not need to be named</dd>


<dt>list_params</dt>
<dd>Optional list of parameters, see <code>.make_parameters()</code>, if
NULL, then the reference level is determined from the contrast matrix
directly.</dd>


<dt>formulas</dt>
<dd>Optional list of formulas, needed if <code>params</code> are passed.
Used to get the correct environment for evaluating expressions in <code>params</code>.
If NULL, then the reference level is determiend from the contrast matrix
directly.</dd>

</dl>

.get_reference_levels: Get reference levels from a (possibly set) list of contrasts

Description

Usage

Value

Arguments