"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction.

"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction. Research Abstract Details 

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"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction. Abstract Text:

Alberto Maydeu-Olivares,Donna L Coffman,Wolfgang M Hartmann,

Reports an error in "Asymptotically distribution-free (ADF) interval estimation of coefficient alpha" by Alberto Maydeu-Olivares, Donna L. Coffman and Wolfgang M. Hartmann (Psychological Methods, 2007[Jun], Vol 12[2], 157-176). The sentence describing Equation 1 is incorrect. The corrected sentence is presented in the erratum. (The following abstract of the original article appeared in record 2007-07830-003.) 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 reliable tests that would be otherwise rejected. Here, the authors performed simulation studies to investigate the behavior of asymptotically distribution-free (ADF) versus normal-theory interval estimators of coefficient alpha under varied conditions. Normal-theory intervals were found to be less accurate when item skewness >1 or excess kurtosis >1. For sample sizes over 100 observations, ADF intervals are preferable, regardless of item skewness and kurtosis. A formula for computing ADF confidence intervals for coefficient alpha for tests of any size is provided, along with its implementation as an SAS macro. (PsycINFO Database Record (c) 2008 APA, all rights reserved).

"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction. Publishing Authors By Initials

A Maydeu-Olivares,DL Coffman,WM Hartmann,

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"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Psychological methods

VOLUME: 12

Page Numbers: 433

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ISSN: 1082-989X

DAY: 8

MONTH: Dec

YEAR: 2007

"Asymptotically distribution-free (ADF) interval estimation of coefficient alpha": Correction. Information

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LANGUAGE: eng

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AFFILIATION: Department of Psychology, University of Barcelona.

Country: United States

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MEDLINETA: Psychol Methods

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