Volume 5. December 2009. | December home |

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Title
Introduction to Rasch Measurement

 Authors
Purya Baghaei (Ph.D.)
Islamic Azad University, Mashad Branch

Nazila Amrahi (M.A.)
Urmia University

Bio Data
Purya Baghaei, assistant professor in the English Department of Islamic Azad University, Mashad, Iran. His main research interests are language testing and the application of Rasch modeling in social science research.

Nazila Amrahi, M.A. student in TEFL at Urmia University, Iran. Her main research interests are language testing and the applications of Rasch modeling in social science research.

Abstract
    The present paper introduces the Rasch model as an alternative measurement framework to classical test theory (CTT). A brief note on measurement and theories of measurement is first given. Then the CTT and its limitations are discussed. Afterwards the Rasch model as an improvement over CTT along with its assumptions, properties and applications is introduced. The contribution that Rasch model can make to establish test validity is finally delineated.