density_plot

Create density plots of posterior distributions with optional prior and
observed-data overlays. Returns a <code>ggplot2</code> object that can be modified
with standard ggplot2 syntax.

Provides a 'brms'-like interface for fitting Bayesian regression models
using 'INLA' (Integrated Nested Laplace Approximations) and 'TMB' (Template Model Builder).
The package offers faster model fitting while maintaining familiar 'brms' syntax and
output formats. Supports fixed and mixed effects models, multiple probability distributions,
conditional effects plots, and posterior predictive checks with summary methods compatible
with 'brms'. 'TMB' integration provides fast ordinal regression capabilities. Implements
methods adapted from 'emmeans' for marginal means estimation and 'bayestestR' for Bayesian
inference assessment. Methods are based on Rue et al. (2009) <doi:10.1111/j.1467-9868.2008.00700.x>,
Kristensen et al. (2016) <doi:10.18637/jss.v070.i05>, Lenth (2016) <doi:10.18637/jss.v069.i01>,
Bürkner (2017) <doi:10.18637/jss.v080.i01>, Makowski et al. (2019) <doi:10.21105/joss.01541>,
and Kruschke (2014, ISBN:9780124058880).

Tony Myers

qbrms

Quick Bayesian Regression Models Using 'INLA' with 'brms' Syntax

density_plot function

<dl><dt>object</dt>
<dd>A <code>qbrms_fit</code> object.</dd>
<dt>parameter</dt>
<dd>Parameter name to plot. If <code>NULL</code>, plots the response distribution.</dd>
<dt>show_prior</dt>
<dd>Logical; if <code>TRUE</code>, overlay the prior density.</dd>
<dt>show_data</dt>
<dd>Logical; if <code>TRUE</code>, overlay the observed data density.</dd>
<dt>ndraws</dt>
<dd>Number of posterior draws to use (default <code>100</code>).</dd>
<dt>prior_ndraws</dt>
<dd>Number of prior draws to use (default <code>100</code>).</dd>
<dt>alpha_levels</dt>
<dd>Named list controlling transparency for layers.</dd>
<dt>colours</dt>
<dd>Named list of colours for layers.</dd>
<dt>seed</dt>
<dd>Optional random seed.</dd>
<dt>verbose</dt>
<dd>Logical; print progress messages.</dd></dl>

Arguments

Density Plot for qbrms Models — density_plot

<dl>

<dt>object</dt>
<dd>A <code>qbrms_fit</code> object.</dd>


<dt>parameter</dt>
<dd>Parameter name to plot. If <code>NULL</code>, plots the response distribution.</dd>


<dt>show_prior</dt>
<dd>Logical; if <code>TRUE</code>, overlay the prior density.</dd>


<dt>show_data</dt>
<dd>Logical; if <code>TRUE</code>, overlay the observed data density.</dd>


<dt>ndraws</dt>
<dd>Number of posterior draws to use (default <code>100</code>).</dd>


<dt>prior_ndraws</dt>
<dd>Number of prior draws to use (default <code>100</code>).</dd>


<dt>alpha_levels</dt>
<dd>Named list controlling transparency for layers.</dd>


<dt>colours</dt>
<dd>Named list of colours for layers.</dd>


<dt>seed</dt>
<dd>Optional random seed.</dd>


<dt>verbose</dt>
<dd>Logical; print progress messages.</dd>

</dl>

density_plot: Density Plot for qbrms Models

Description

Usage

Value

Arguments