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Chapter 4 | An Introduction to Rasch Measurement

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An Introduction to Rasch Measurement
Everett V.Smith Jr.
Richard M.Smith

Rasch measurement is a model–based approach in measurement that has become increasingly popular for scale construction in the social (and other) sciences. Rasch measurement provides a way to convert ordinal observations (raw scores) into linear measures (logits) (Fischer, 1995a; Rasch, 1960; Wright & Mok, 2004), thus making it an important tool in scientific research where phenomena are observed on an ordinal scale and parametric statistics, which assume an interval/ratio scale, are employed for analysis (Wright & Linacre, 1989). This chapter introduces basic concepts of Rasch measurement models ...

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