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

An object containing ability estimates, as output by function
<code>mlebme</code> or <code>eap</code>

theta

Computes the IRT true scores (test response function at the estimated
ability) and an estimate of their standard error via the delta theorem,
treating item parameters as known).

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

tsc: True scores with standard errors

Description

Usage

Arguments

Value

See Also

Examples