**Definition:**Cronbach's alpha is a test for a model or survey's internal consistency. Called a 'scale reliability coefficient' sometimes.

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 score is computed from each test item and the overall rating, called a 'scale' is defined by the sum of these scores over all the test items. Then reliability a is defined to be the square of the correlation between the measured scale and the underlying factor the scale was supposed to measure.(Econterms)

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