# Declared Priors versus Fitted Posteriors

The bridge uses the backend-independent prior specification retained by `gp3bayes`; saved backend prior draws are not required.

    bridge <- prior_posterior_bridge(fit)

    prior_posterior_summary_table(bridge)
    prior_posterior_distance_table(bridge)

    plot_prior_posterior_density(bridge)
    plot_prior_posterior_intervals(bridge)
    plot_prior_posterior_shift(bridge)
    plot_prior_posterior_contraction(bridge)

Shift, contraction, interval overlap, Kolmogorov-Smirnov distance, and quantile-based Wasserstein distance are descriptive marginal summaries, not automatic measures of prior adequacy.