Confidence Intervals for Cronbach's Coefficient Alpha Values
Alex J. Koning
Erasmus University Rotterdam (EUR) - Erasmus School of Economics (ESE)
Philip Hans Franses
Erasmus University Rotterdam (EUR) - Department of Econometrics
18 2003 6,
ERIM Report Series Reference No. ERS-2003-041-MKT
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.
Number of Pages in PDF File: 47
Keywords: Cronbach's alpha, test reliability, confidence intervals
JEL Classification: M, M31, C44, C19working papers series
Date posted: August 26, 2006
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