Correction of Item-Total Correlations in Item Analysis

descriptionPublicationkeyboard_double_arrow_right Article 01 Jun 1963 English Publisher:Cambridge University Press (CUP)Journal:Psychometrika, volume 28, pages 211-218 (issn: 0033-3123, eissn: 1860-0980,

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Authors: Sten Henrysson;

doi: 10.1007/bf02289618

Correction of Item-Total Correlations in Item Analysis

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Abstract

The biserial correlation between an item and the total test of which the item is a part tends to be misleadingly high when used in item analysis, since the item is included in the total test. Two formulas with correction for this overlap are derived and compared with Zubin's and Guilford's formulas. One of the new coefficients is invariant to test length.

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Stockholm University
Sweden

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