Equating tests |
This is for 32-bit Facets 3.87. Here is Help for 64-bit Facets 4
Equating in many-facet situations is more complex than equating two facets, e.g., multiple-choice tests.
The general rules are:
(a) All facets except one must be equated. That one is usually persons, except in studies of rater behavior.
(b) There need to be at least 5 common elements for each facet. This is a rule of thumb. In principle, one element will work. But it gives no quality-control.
(c) First do independent analyses of each data set.
(d) Then cross-plot the measures for common elements in each facet.
(e) Disregard as "common" those elements whose measures are clearly different across datasets.
(f) If the remaining common elements for a facet are close to a line parallel to the identity line, than anchor those elements, or combine the data sets.
(g) If the remaining common elements for a facets are still somewhat of a cloud, then use group-anchoring of that facet to equate it.
(h) Continually monitor criterion-level-based success-rates and other indicators to check that the equating is making sense.
Help for Facets Rasch Measurement and Rasch Analysis Software: www.winsteps.com Author: John Michael Linacre.
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