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Rasch Model for Measurement
Rasch model for measurement

George Rasch, a Danish mathematician, realized that, to be of any use at all, a measure must retain its quantitative status, within reason, regardless of the context in which it occurs. Like a yardstick, each test or rating scale item must maintain its level of difficulty, regardless of who is responding to it. It also follows that the person measured must retain the same level of competence or ability, regardless of which particular test items are encountered, so long as whatever items are used belong to the calibrated set of items which define the variable under study. The implementation of this essential concept of invariance or objectivity has been successfully extended in the past decades to the leniency ...

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