The minimum X² method for computing equating
coefficients for tests with dichotomously scored items
was extended to the case of Samejima’s graded response
items. The minimum X² method was compared
with the test response function method (also referred to
as the test characteristic curve method) in which the
equating coefficients were obtained by matching the test response functions of the two tests. The minimum
X² method was much less demanding computationally
and yielded equating coefficients that differed little
from those obtained using the test response function
approach. Index terms: equating, graded response
model, item response theory, minimum X²
response function method.
Kim, Seock-Ho & Cohen, Allan S. (1995). A minimum X² method for equating tests under the graded response model. Applied Psychological Measurement, 19, 167-176. doi:10.1177/014662169501900204
Kim, Seock-Ho; Cohen, Allan S..
A minimum X² method for equating tests under the graded response model.
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