tsc {irtoys}

True scores with standard errors

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

tsc(ip, theta)

Arguments

ip

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

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

th <- mlebme(resp=Scored, ip=Scored2pl)
tsc(Scored2pl, th)