2007
DOI: 10.1037/1082-989x.12.2.157
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Asymptotically distribution-free (ADF) interval estimation of coefficient alpha.

Abstract: The point estimate of sample coefficient alpha may provide a misleading impression of the reliability of the test score. Because sample coefficient alpha is consistently biased downward, it is more likely to yield a misleading impression of poor reliability. The magnitude of the bias is greatest precisely when the variability of sample alpha is greatest (small population reliability and small sample size). Taking into account the variability of sample alpha with an interval estimator may lead to retaining reli… Show more

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Cited by 97 publications
(121 citation statements)
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“…Theoretically, ordinal alpha equals the true reliability when the items are tau-equivalent and fit a one-factor model with equal factor pattern coefficients (Maydeu-Olivares et al, 2007;Zumbo et al, 2007).…”
Section: Ordinal Coefficient Alphamentioning
confidence: 99%
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“…Theoretically, ordinal alpha equals the true reliability when the items are tau-equivalent and fit a one-factor model with equal factor pattern coefficients (Maydeu-Olivares et al, 2007;Zumbo et al, 2007).…”
Section: Ordinal Coefficient Alphamentioning
confidence: 99%
“…The sample sizes were selected based on previous studies and represent sample sizes often noted in applied research (Cui & Li, 2012;Duhachek & Iacobucci, 2004;Maydeu-Olivares et al, 2007; Padilla et al, 2012; Romano et al, 2011; Yuan & Bentler, 2002;Zumbo et al, 2007). While EVALUATION OF CI FOR ORDINAL COEFFICIENT ALPHA 166 large sample sizes are always desirable, they are not always realistic.…”
Section: Sample Size (N)mentioning
confidence: 99%
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