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Error of Measurement2
Test Items2
Classification1
Computation1
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Patients1
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Psychological Methods2
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Emons, Wilco H. M.1
Meijer, Rob R.1
Rae, Gordon1
Sijtsma, Klaas1
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A Note on Using Stratified Alpha to Estimate the Composite Reliability of a Test Composed of Interrelated Nonhomogeneous Items
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Rae, Gordon – Psychological Methods, 2007
The relationship between stratified alpha (alpha-sub(s)) and the reliability of a test composed of interrelated nonhomogeneous items is examined. It is mathematically demonstrated that when there is congeneric equivalence within the strata or subtests, the difference between the coefficients is a function of the variances of the loadings within…
Descriptors: Test Reliability, Test Items, Computation, Error of Measurement
On the Consistency of Individual Classification Using Short Scales
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Emons, Wilco H. M.; Sijtsma, Klaas; Meijer, Rob R. – Psychological Methods, 2007
Short tests containing at most 15 items are used in clinical and health psychology, medicine, and psychiatry for making decisions about patients. Because short tests have large measurement error, the authors ask whether they are reliable enough for classifying patients into a treatment and a nontreatment group. For a given certainty level,…
Descriptors: Psychiatry, Patients, Error of Measurement, Test Length