The original responses to the items in the test: persons as
rows, items as columns. May contain NA.

choices

A vector containing the key (correct answers) to the items in
<code>choices</code>. If not given, the function will check if all data are either
0, 1, or NA: if yes, NA are recoded as 0, else an error message is returned.

Recode non-responses to false responses?

na.false

Given a key, score a multiple choice test, i.e. recode the original choices
to right (1) or wrong (0). Missing responses are treated as wrong.

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.

sco: Score a multiple choice test

Description

Usage

Arguments

Value

Examples