Uses and abuses of coefficient alpha

Article Abstract:

Coefficient alpha is a function of the interrelatedness of the test items and test length, rather than the homogeneity of the interitem correlations or their unidimensionality. The use of alpha as the correctional basis for attenuation, results in overestimation of the true correlation in multidimensional measures. Test use and interpretation determine the satisfactory levels of alpha. The relationships of multiple measures require the inclusion of intercorrelations and corrected intercorrelations in addition to the presentation of alpha.

Analysis, Psychometrics, Correlation (Statistics)

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More information from fewer questions: the factor structure and item properties of the original and the Brief Fear of Negative Evaluation scale

Article Abstract:

Statistical methods designed for categorical data were used to perform confirmatory factor analyses and item response theory (IRT) analyses of the Fear of Negative Evaluation scale (FNE) and the Brief FNE. Results suggested that a 2-factor model fit the data better for both the FNE and BFNE, while the IRT analyses indicated that the FNE items discriminated only at lower levels of the underlying construct, whereas the BFNE items discriminated across a wider range.

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Is it prudent to administer all items for each child behavior checklist cross-informant syndrome? Evaluating the psychometric properties of the youth self-report dimensions with Confirmatory Factor Analysis and Item Response Theory

Article Abstract:

The Youth Self-Report (YSR) forms of the Child Behavior Checklist (CBCL), cross-informant syndromes were derived as the result of a survey conducted in ten nations. The study used Confirmatory Factor Analyses (CFAs) to test factor model fit for Cross-Informant Syndromes and the Item Response Theory to eliminate the psychometric properties of individual items on each dimension.

Psychological aspects, Children, Child behavior, Syndromes, Child behaviour

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