Plot Effective Sample Size Diagnostic

Creates a visual display of effective sample size (ESS) for all parameters, expressed as a ratio of ESS to total samples. Low ESS indicates high autocorrelation.

Usage

plot_ess(fit, type = c("bulk", "tail"), threshold = 400, pars = NULL)

Arguments

fit

A ratiod_fit object.

type

Type of ESS: "bulk" (default) or "tail".

threshold

Minimum acceptable ESS (default: 400).

pars

Character vector of parameter names to include.

Value

A ggplot object (if ggplot2 available) or base R plot (invisible).

Details

ESS/iter ratio interpretation:

• Green: ESS >= threshold

• Yellow: threshold/2 <= ESS < threshold

• Red: ESS < threshold/2

See also

plot_rhat(), diagnostic_summary(), diagnostics()

Examples

# See plot_rhat() examples for fitting a model
# plot_ess(fit)
# plot_ess(fit, type = "tail")