tsc: True scores with standard errors

Description Usage Arguments Value Author(s) See Also Examples

View source: R/tracelines.R

Description

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).

Usage

1
  tsc(ip, theta)

Arguments

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.

theta

An object containing ability estimates, as output by function mlebme or eap

Value

A matrix with the true scores in column 1, and their standard errors of measurement (SEM) in column 2

Author(s)

Ivailo Partchev

See Also

mlebme, eap, trf

Examples

1
2
th <- mlebme(resp=Scored, ip=Scored2pl$est)
tsc(Scored2pl$est, th)

lebebr01/irtoys-2 documentation built on May 20, 2019, 11:29 p.m.