stan_columns_plot function

View a plot of summary statistics after using irt_stan

This function creates a figure summarizing parameter-level diagnostics such as R hat and effective sample size.

stan_columns_plot(fit, stat = "Rhat", ...)

Arguments

• fit: A stanfit-class object created by irt_stan

  or stan.

• stat: A string for the statistic from the summary method for a stanfit object to plot. The default is "Rhat" but could also be "n_eff" for the effective sample size.

• ...: Additional options (such as pars), passed to the summary method for a stanfit object. Not required.

Returns

A ggplot object.

Examples

# Make a suitable data list:
spelling_list <- irt_data(response_matrix = spelling[, 2:5],
                          covariates = spelling[, "male", drop = FALSE],
                          formula = ~ 1 + rescale_binary(male))

## Not run:

# Fit a latent regression  2PL
twopl_fit <- irt_stan(spelling_list, model = "2pl_latent_reg.stan",
                      iter = 2000, chains = 4)

# Get a plot showing Rhat statistics
rhat_columns(twopl_fit)

# Get a plot showing number of effective draws
rhat_columns(twopl_fit, stat = "n_eff")
## End(Not run)

See Also

See stan_rhat, which provides a histogram of Rhat statistics.