Reliability in Psychology and Psychological Measurement, with Focus on Cronbach’s Alpha

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  • 心理学と心理測定における信頼性について
  • 測定・評価・研究法部門 心理学と心理測定における信頼性について : Cronbachのα係数とは何なのか,何でないのか
  • ソクテイ ・ ヒョウカ ・ ケンキュウホウ ブモン シンリガク ト シンリ ソクテイ ニ オケル シンライセイ ニ ツイテ : Cronbach ノ aケイスウ トワ ナン ナ ノ カ,ナン デ ナイ ノ カ
  • Reliability in Psychology and Psychological Measurement, with Focus on Cronbach’s Alpha
  • —Cronbachのα係数とは何なのか，何でないのか—

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    Studies in educational psychology in Japan are reviewed from the viewpoint of reliability.  Cronbach’s alpha is one of the most frequently used —if not fully understood— measures of reliability.  The main purpose of this note is to give an overview of what alpha is and is not.  Specifically, it is shown that (1) alpha is the mean of all split-half reliabilities, (2) alpha is a lower bound of reliability, and (3) alpha equals reliability under essential tau-equivallence.  It is also shown that (1) alpha is not a measure of unidimentionality or homogeneity, (2) there are criticisms on understanding alpha as a measure of internal consistency, (3) alpha depends on a variety of characteristics including number of items, and (4) alpha is not a greatest lower bound.  Alternative measures of reliability and future issues are discussed.

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