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NOTE ON THE ATTENUATING EFFECT OF ZERO‐VARIANCE ITEMS ON KR‐20
Author(s) -
SHOEMAKER DAVID M.
Publication year - 1969
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.1745-3984.1969.tb00685.x
Subject(s) - variance (accounting) , reliability (semiconductor) , zero (linguistics) , statistics , psychology , mathematics , physics , philosophy , thermodynamics , linguistics , power (physics) , accounting , business
Kuder‐Richardson reliability formulas 20 and 21 should not be applied to tests containing items either answered correctly or incorrectly by all examinees. The extent to which KR‐20 is attenuated by zero‐variance items is derived.