I cannot find a way to calculate a confidence interval for Cronbah Alpha. I have SPSS 23 and Stata 13, they don`t calculate it. I applied the formulas given by Alex J. Koning and Philip Hans Franses (Confidence Intervals for Cronbach’s Coefficient Alpha Values. Erasmus Research Institute of Management REPORT SERIES RESEARCH IN MANAGEMENT) but they did not work properly (lower limit was acceptable but upper limit was greater than 1).

So I`m looking for an answer or some advice from my colleagues.

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