Confidence Intervals for Cronbach's Coefficient Alpha Values

47 Pages Posted: 26 Aug 2006

See all articles by Alex J. Koning

Alex J. Koning

Erasmus University Rotterdam (EUR) - Erasmus School of Economics (ESE)

Philip Hans Franses

Erasmus University Rotterdam (EUR) - Department of Econometrics

Date Written: 18 2003 6,

Abstract

Coefficient Alpha, which is widely used in empirical research, estimates the reliability of a test consisting of parallel items. In practice it is difficult to compare values of alpha across studies as it depends on the number of items used. In this paper we provide a simple solution, which amounts to computing the confidence intervals of an alpha, as these intervals automatically account for differences across the numbers of items. We also give appropriate statistics to test for significant differences of alpha values across studies.

Keywords: Cronbach's alpha, test reliability, confidence intervals

JEL Classification: M, M31, C44, C19

Suggested Citation

Koning, Alex J. and Franses, Philip Hans, Confidence Intervals for Cronbach's Coefficient Alpha Values (18 2003 6,). ERIM Report Series Reference No. ERS-2003-041-MKT, Available at SSRN: https://ssrn.com/abstract=423658

Alex J. Koning (Contact Author)

Erasmus University Rotterdam (EUR) - Erasmus School of Economics (ESE) ( email )

P.O. Box 1738
3000 DR Rotterdam, NL 3062 PA
Netherlands
31 10 4081268 (Phone)
31 10 4527746 (Fax)

Philip Hans Franses

Erasmus University Rotterdam (EUR) - Department of Econometrics ( email )

P.O. Box 1738
3000 DR Rotterdam
Netherlands
+31 10 408 1278 (Phone)
+31 10 408 9162 (Fax)

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