Description Usage Arguments Details Value References
Cronbach's alpha measures how correlated are the items in a test License :GPL (>= 2) Extracted from multilevel_2.5 package
1 | cronbach(test)
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test |
a matrix or a Dataframe that holds the test response data |
the coefficient is calculated alpha = (n/n-1)*(1 - (sum V_i/V_t)) where V_t is the variance of test scores and V_i is the variance of item scores. It is desirable that the items are closely interrelated (coefficient near 1).
Cronbach's alpha for the test.
Cronbach L. J. (1951) Coefficient Alpha and the internal structure of tests. Psychometrika, 16,297-334
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