Effect of Group Heterogeneity on Item Parameters  

Oleh:

Gulliksen, Harold

Jenis: Article from Journal - e-Journal
Dalam koleksi: Psychometrika: A Journal of Quantitative Psychology vol. 16 no. 3 (Sep. 1951), page 285-296.
Topik: Group Heterogeneity; Item Parameters
Fulltext: Effect of Group Heterogeneity on Item Parameters.pdf (511.87KB)

Isi artikel

Most indexes of item validity and difficulty vary systematically with changes in the mean and variance of the group. Formulas are presented showing how certain item parameters will vary with these alterations in group mean and variance. Item parameters are also suggested which should remain invariant under such changes. These parameters are developed under two different assumptions: first, the assumption that thetotal distribution of the item ability variable is normal, and, second, that the distribution of the item ability variablefor each array of the explicit selection variable is normal.

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