[Rasch] Rasch and Misfit
Mike Linacre (RMT)
rmt at rasch.org
Sun Jul 6 13:18:31 EST 2008
Thank you, Steve.
You wrote: Either way, assigning Joe a "score" is inappropriate.
Comment: Yes, if the test has no real purpose, but consider the completely
misfitting situation were Joe gets all the easy items wrong, and all the
hard items right. If there is a purpose for the test, a useful score to
report would be the one that matches that purpose.
How about a language test? Native learners usually learn to speak
colloquially before learning to read and write. Second-language learners
may learn to read and write before learning to speak colloquially. So
"easy" and "hard" items reverse. A useful measure is based on the purpose
for the test, e.g., "hiring interpreters" or "hiring translators".
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