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Note on Construction of an Item Analysis Table for the High-Low-27-Per-Cent Group Method

Published online by Cambridge University Press:  01 January 2025

C. T. Fan
C. T. Fan*
Affiliation:
Educational Testing Service
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Abstract

This paper describes the construction of a new item analysis table for the high-low-27-per-cent group method. The table provides a ready means of translating the observed proportions of success in the two extreme groups (pH, pL) into measures of item difficulty and item discrimination (p, Δ, and r). The tabled values of both the difficulty index, p, and the discrimination index, r, have been derived from Karl Pearson's tables of the normal bivariate surface.

Type
Original Paper
Information
Psychometrika , Volume 19 , Issue 3 , September 1954 , pp. 231 - 237
Copyright
Copyright © 1954 The Psychometric Society

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