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My questionnaire is consists of ten 5-point scaled likert items. If the likert items have a good chronbach alpha, is it ok to take the average score of 10 items?

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Technically, no. Likert scales are ordinal and, therefore, adding them isn't right.

Practically, yes. People do this all the time.

But a better method would be to do a factor analysis (accounting for the fact that the data are ordinal) and using that, rather than a simple sum. In my experience, though, it winds up not making that much difference.

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  • $\begingroup$ If you are bothering to do factor analysis, you might as well use the factor scores. You can then use standard methods to compare them. $\endgroup$ – Peter Flom - Reinstate Monica Apr 29 '19 at 13:00
  • $\begingroup$ Thank u again sir. Sorry, i accidentally deleted my previous comment. $\endgroup$ – KevinM2019 Apr 29 '19 at 13:05

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