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tsc

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

Examples

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

irtoys

A Collection of Functions Related to Item Response Theory (IRT)

v0.2.1

GPL (>= 2)

Authors

Ivailo Partchev [aut, cre], Gunter Maris [aut], Tamaki Hattori [ctb]

Initial release

2017-12-15

tsc