Alpha Reliability for dichotomous nominal data?

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Hakan Koğar

Hi Abbie Mcguire

Typical reliability coefficient for nominal data is KR-20. But you can use some modern techniques, like omega coefficient or M-S (Molenaar Sijstma) reliability coefficient. I suggest R software for all 3 coefficients

Abbie Mcguire

Hi Hakan,

Thanks so much for your response! Do you recommended any of the 3 coefficients you listed above before the others e.g. one being better to use than the other?

Thanks

Omega is better according to simulation studies. But KR-20 reliability coefficient has more common usage. You can report all of them, the more is better

Eulogio Cordón-Pozo

To calculate the omega coefficient with IBM SPSS, I recommend using the OMEGA macro developed by A.F. Hayes and that you can get for free by visiting

http://afhayes.com/spss-sas-and-r-macros-and-code.html

Hayes, A. F., & Coutts, J. J. (2020). Use omega rather than Cronbach's alpha for estimating reliability. But... Communication Methods and Measures, 14, 1-24. DOI: Article Use Omega Rather than Cronbach’s Alpha for Estimating Reliab...