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

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

Ok, that's great. Thanks so much!

Your welcome, good luck with your research Abbie Mcguire

Hi

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...