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- Publisher
- Cambridge University Press
- Copyright
- 1941 Psychometric Society
- ISSN
- 0033-3123
- eISSN
- 1860-0980
- DOI
- 10.1007/bf02288588
- Publisher site
- See Article on Publisher Site
Abstract
Abstract This paper discusses the influence of test difficulty on the correlation between test items and between tests. The greater the difference in difficulty between two test items or between two tests the smaller the maximum correlation between them. In general, the greater the number of degrees of difficulty among the items in a test or among the tests in a battery, the higher the rank of the matrix of intercorrelations; that is, differences in difficulty are represented in the factorial configuration as additional factors. The suggestion is made that if all tests included in a battery are roughly homogeneous with respect to difficulty existing hierarchies will be more clearly defined and meaningful psychological interpretation of factors more readily attained.
Journal
Psychometrika – Cambridge University Press
Published: Oct 1, 1941
Keywords: Psychometrics; Assessment, Testing and Evaluation; Statistics for Social Sciences, Humanities, Law; Statistical Theory and Methods