Premium
AN ANALYTICAL PROCEDURE FOR THE EQUIPERCENTILE METHOD OF EQUATING TESTS
Author(s) -
LINDSAY CARL A.,
PRICHARD MARK A.
Publication year - 1971
Publication title -
journal of educational measurement
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.917
H-Index - 47
eISSN - 1745-3984
pISSN - 0022-0655
DOI - 10.1111/j.1745-3984.1971.tb00926.x
Subject(s) - equating , extrapolation , goodness of fit , statistics , mathematics , smoothing , rasch model
Prior use of the equipercentile method of test equating was based on a graphic procedure which is tedious, subject to smoothing errors, and non‐analytical. Recognition of the equipercentile method as a curve‐fitting procedure for two cumulative percentage distributions leads to a proposed analytical solution to the problem through use of linear estimates for successive “missing” cumulative percentage points. A complete equipercentile procedure which uses the proposed method and provides linear and quadratic functions for goodness‐of‐fit and extrapolation is discussed and illustrated with data from a test equating project.