A matrix of responses: persons as rows, items
  as columns, entries are either 0 or 1, no missing data

resp

Item parameters: a matrix with one row per
  item, and three columns: [,1] item discrimination
  $a$, [,2] item difficulty $b$, and [,3] asymptote
  $c$.

Mean of the apriori distribution. Ignored when
  <code>method="ML"</code>. Default is 0.

Standard deviation of the apriori
  distribution. Ignored when <code>method="ML"</code>. Default is
  1.

sigma

The number of plausible values to draw for each
  person (default is 5).

Draws (by rejection sampling) plausible values from the
  posterior distribution of ability

models

Provides a simple common interface to the estimation of
        item parameters in IRT models for binary responses with three
        different programs (ICL, BILOG-MG, and ltm, and a variety of
        functions useful with IRT models.

dpv: Draw plausible values

Description

Usage

Arguments

Value

See Also

Examples