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A Note on the Bias of UCON Item Parameter Estimation in the Rasch Model
Author(s) -
Gruijter Dato N. M.
Publication year - 1990
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/j.1745-3984.1990.tb00749.x
Subject(s) - rasch model , item response theory , econometrics , statistics , estimation , computer science , mathematics , psychometrics , economics , management
Divgi (1986) demonstrated that the bias of UCON item parameter estimates is not removed by the factor (n − 1)/n. Andrich (1989) argued in this journal that the demonstration was faulty. In this note a complete proof of Divgfs conclusion is presented.