tsc function

True scores with standard errors

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).

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

Returns

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

Examples

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

See Also

mlebme, eap, trf

Author(s)

Ivailo Partchev