Transformed statistics for use in test construction.

This paper draws together the several formulae which have been developed for determining item-test and/or item-criterion statistics which utilize highly efficient grouping. Grouping transformations have been found to be relatively efficient and precise enough for general use. Departures from normality because of grouping transformations are not extreme enough to invalidate results. (PsycINFO Database Record (c) 2010 APA, all rights reserved)