This has resulted in a wide variance of test reliability. In the case of psychometric tests, most fall within the range of 0.75 to 0.83 with at least one claiming a Cronbach`s alpha above 0.90 (Nunnally 1978, page 245–246). ==Internal consistency== Cronbach`s alpha will generally increase as the intercorrelations among test items increase, and.....
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http://en.wikipedia.org/wiki/Cronbach`s_alpha
A test for a model or survey's internal consistency. Called a 'scale reliability coefficient' sometimes. The remainder of this definition is partial and unconfirmed. Cronbach's alpha assesses the reliability of a rating summarizing a group of test or survey answers which measure some underlying factor (e.g., some attribute of the test-taker). A sco...
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http://www.econterms.com/glossary.cgi?query=Cronbach's+alpha
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