scoreMetric

<p>Item parameters: the output of <code>est</code>, or a 3-column matrix 
corresponding to its first element, <code>est</code>.</p>

<p>From a set of estimated item parameters, compute an item response function in sum score
metric, i.e., the probabilities of a correct response predicted by the model at abilities
corresponding to the possible (raw) sum scores.</p>

models

A collection of functions useful in learning and practicing IRT,
which can be combined into larger programs. Provides basic CTT analysis,
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), ability estimation (MLE, BME, EAP, WLE, plausible
values), item and person fit statistics, scaling methods (MM, MS, Stocking-Lord,
and the complete Hebaera method), and a rich array of parametric and
non-parametric (kernel) plots. Estimates and plots Haberman's interaction model
when all items are dichotomously scored.

Ivailo Partchev

irtoys

scoreMetric: Sum score metric

Description

Usage

Arguments

Value