Open AccessEnhancing measurement in science education research through Rasch analysis: Rationale and properties
Author(s) -
Jørgen Sjaastad
Publication year - 2014
Publication title -
nordina
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 3
eISSN - 1894-1257
pISSN - 1504-4556
DOI - 10.5617/nordina.662
Subject(s) - rasch model , item response theory , differential item functioning , polytomous rasch model , classical test theory , psychology , competence (human resources) , test (biology) , psychometrics , mathematics education , developmental psychology , social psychology , paleontology , biology
This article presents the basic rationale of Rasch theory and seven core properties of Rasch modeling; analyses of test targeting, person separation, person fit, item fit, differential item functioning, functioning of response categories and tests of unidimensionality. Illustrative examples are provided consecutively, drawing on Rasch analysis of data from a survey where students in the 9th grade responded to questions regarding their mathematics competence. The relationship between Rasch theory and classical test theory is commented on. Rasch theory provides science and mathematics education researchers with valuable tools to evaluate the psychometric quality of tests and questionnaires and support the development of these