[Estimation of Cronbach's alpha coefficient in the context of item response theory].
Shinrigaku Kenkyu
; 73(3): 227-33, 2002 Aug.
Article
en Ja
| MEDLINE
| ID: mdl-12436881
ABSTRACT
Cronbach's alpha coefficient is an index of reliability for the total score of a set of measurements. The alpha takes a value of 1.0 when the total score variance is perfectly attributable to the common factors running through the test items. In this research, a method of estimating Cronbach's coefficient alpha is proposed for the case where the parameters of dichotomous item response model are known and the ability distribution of subjects is given. In addition, the case of polytomous response model where the item parameters are estimated by graded response model (Samejima, 1969) is also considered, and a method of estimating the alpha coefficient is proposed for that case.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Pruebas Psicológicas
/
Psicometría
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
Ja
Revista:
Shinrigaku Kenkyu
Año:
2002
Tipo del documento:
Article