The study reports a feasibility study using item
response theory (IRT) as a means of equating the
Test of Standard Written English (TSWE). The
study focused on the possibility of pre-equating,
that is, deriving the equating transformation prior
to the final administration of the test. The three-parameter
logistic model was postulated as the response
model and its fit was assessed at the item,
subscore, and total score level. Minor problems
were found at each of these levels; but, on the
whole, the three-parameter model was found to portray
the data well. The adequacy of the equating
provided by IRT procedures was investigated in two
TSWE forms. It was concluded that pre-equating
does not appear to present problems beyond those
inherent to IRT-equating.
Bejar, Isaac I & Wingersky, Marilyn S. (1982). A study of pre-equating based on item response theory. Applied Psychological Measurement, 6, 309-325. doi:10.1177/014662168200600308
Bejar, Isaac I.; Wingersky, Marilyn S..
A study of pre-equating based on item response theory.
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