stan_trace: Plot the MCMC posterior draws by chain

In idealstan: Robust Measurement with 'Stan'

Plot the MCMC posterior draws by chain

Description

This function allows you to produce trace plots for assessing the quality and convergence of MCMC chains.

Usage

stan_trace(object, ...)

Arguments

object	A fitted idealstan model
...	Other options passed on to stan_trace

Details

To use this function, you must pass a fitted idealstan object along with the name of a parameter in the model. To determine these parameter names, use the summary function or obtain the data from a plot by passing the return_data=TRUE option to id_plot_persons or id_plot_persons_dyn to find the name of the parameter in the Stan model.

This function is a simple wrapper around mcmc_trace. Please refer to that function's documentation for further options.

Value

A ggplot2 object (from mcmc_trace) showing MCMC trace plots for the selected parameter.

Examples

data('senate114')
senate114$cast_code <- ifelse(senate114$cast_code=="Absent", NA,
                              as.integer(senate114$cast_code) - 1L)
sen_data <- id_make(senate114, outcome_disc='cast_code',
                    person_id='bioname', item_id='rollnumber',
                    group_id='party_code')
sen_est <- id_estimate(sen_data, model_type=1, 
           fixtype='vb_full', use_method="pathfinder", ncores=4)
stan_trace(sen_est, par='L_full[1]')

idealstan documentation built on May 13, 2026, 1:08 a.m.