Graph of marginal posterior densities for the item parameters (a, b or c).
parameter.plot(mcmclist, ...)A mcmc.2pnob or mcmc.3pnob class object.
Further arguments.
Graph of marginal posterior densities for the item parameters (a, b or c).
Graph of marginal posterior densities of the item parameter a, b for mcmc.2pnob object or a, b, c for mcmc.3pnob object. The center of error bar corresponds to the marginal posterior mean and the extremes correspond to percentiles of the marginal posterior density (These are delimited by prob). For example, prob = c(0.05, 0.95) is equivalent to the 5th and 95th percentiles of the marginal posterior density.
Johnson, V. E. & Albert, J. H. (1999). Ordinal Data Modeling. New York: Springer.