Plot Prior Density of Alpha

Plot Prior Density of Alpha

Usage

plot_alpha_prior(
  fit = NULL,
  a = NULL,
  b = NULL,
  engine = c("ggplot2", "base"),
  base_size = 11,
  ci_level = 0.95,
  n_grid = 500,
  show = TRUE
)

Arguments

fit

A DPprior_fit object, or NULL if a and b provided directly.

a

Numeric; shape parameter (used if fit is NULL).

b

Numeric; rate parameter (used if fit is NULL).

engine

"ggplot2" (default) or "base".

base_size

Base font size.

ci_level

Credible interval level (default 0.95).

n_grid

Number of grid points.

show

If TRUE, print the plot.

Value

A ggplot object or invisible(NULL) for base.

See also

DPprior_fit for fitting, plot.DPprior_fit for S3 plot method

Other visualization: DPprior_colors(), plot_K_prior(), plot_dual_comparison(), plot_dual_dashboard(), plot_prior_dashboard(), plot_tradeoff_curve(), plot_tradeoff_dashboard(), plot_w1_prior(), theme_DPprior()

Examples

# From fit object
fit <- DPprior_fit(J = 50, mu_K = 5, var_K = 8)
#> Warning: HIGH DOMINANCE RISK: P(w1 > 0.5) = 48.1% exceeds 40%.
#>   This may indicate unintended prior behavior (Lee, 2026).
#>   Consider using DPprior_dual() for weight-constrained elicitation.
#>   See ?DPprior_diagnostics for interpretation.
plot_alpha_prior(fit)



# Direct parameter specification
plot_alpha_prior(a = 1.6, b = 1.2)