Open AccessNOTE ON CONSTRUCTION OF AN ITEM ANALYSIS TABLE FOR THE HIGH‐LOW‐27‐PER‐CENT GROUP METHOD
Author(s) -
Fan C. T.
Publication year - 1952
Publication title -
ets research bulletin series
Language(s) - English
Resource type - Journals
eISSN - 2333-8504
pISSN - 0424-6144
DOI - 10.1002/j.2333-8504.1952.tb00227.x
Subject(s) - table (database) , bivariate analysis , statistics , index (typography) , group (periodic table) , mathematics , computer science , data mining , programming language , chemistry , organic chemistry
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 (p H , p L ) 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.