eap {irtoys}R Documentation

EAP estimation of ability

Description

Estimates the expectation of the posterior distribution of the latent variable ("ability") for each person.

Usage

eap(resp, ip, qu)

Arguments

resp A matrix of responses: persons as rows, items as columns, entries are either 0 or 1, no missing data
ip Item parameters: a matrix with one row per item, and three columns: [,1] item discrimination a, [,2] item difficulty b, and [,3] asymptote c.
qu A quadrature object produced with normal.qu or read in with read.qu.icl

Value

A matrix with the ability estimates in column 1 and their standard errors of measurement (SEM) in column 2

Author(s)

Ivailo Partchev

See Also

mlebme, normal.qu, read.qu.icl

Examples

data(Scored)
p.2pl <- est(Scored, model="2PL", engine="ltm")
th.eap <- eap(resp=Scored, ip=p.2pl, qu=normal.qu())

[Package irtoys version 0.1.1 Index]