ARCHIVED: In Stata, how do I compute Cronbach's alpha statistic to test reliability?

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Cronbach's alpha examines reliability by determining the internal consistency of a test or the average correlation of items (variables) within the test. In Stata, the .alpha command conducts the reliability test.

For example, suppose you wish to test the internal reliability of ten variables, v1 through v10. You could run the following:

  .alpha v1-v10, item

In the above example, the item option displays the effects of removing an item from the scale.

To run the same test in SPSS or SAS, see ARCHIVED: In SPSS, how do I compute Cronbach's alpha statistic to test reliability? or ARCHIVED: In SAS, how do I compute Cronbach's alpha statistic?

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