Wright (1977) outlined procedures for equating
tests and test scores using the Rasch model. This
paper summarizes the results of a study in which
those Rasch model procedures are used to calibrate
and then to link vertically six levels of the Reading
Comprehension Test of the Iowa Tests of Basic
Skills. The derived Rasch ability scale estimates are
then compared to norm-referenced, grade-equivalent
scale estimates for scores across the test
levels. The results of these comparisons suggest that
where discrepancies in the two scales emerge, the
more accurate and perhaps more useful measure is
provided by the Rasch scale.
Guskey, Thomas R. (1981). Comparison of a Rasch model scale and the grade-equivalent scale for vertical equating of test scores. Applied Psychological Measurement, 5, 187-201. doi:10.1177/014662168100500204
Guskey, Thomas R..
Comparison of a Rasch model scale and the grade-equivalent scale for vertical equating of test scores.
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