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Last data update: 2014.03.03

R: EAP estimation of ability

eap	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, and the number of non-missing reponses in column 3

Author(s)

Ivailo Partchev

Examples

th.eap <- eap(resp=Scored, ip=Scored2pl$est, qu=normal.qu())