eap {irtoys} | R Documentation |
Estimates the expectation of the posterior distribution of the latent variable ("ability") for each person.
eap(resp, ip, qu)
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 |
A matrix with the ability estimates in column 1 and their standard errors of measurement (SEM) in column 2
Ivailo Partchev
mlebme
, normal.qu
, read.qu.icl
data(Scored) p.2pl <- est(Scored, model="2PL", engine="ltm") th.eap <- eap(resp=Scored, ip=p.2pl, qu=normal.qu())