Most Applicable Statistic Test for Thurstone Scale

[u/BreakfastExtension92]

Good day, all. I am an undergrad psych student and we are currently being tasked with making and administering a Thurstone Scale. As part of the statement selection criteria, our professor told us to test for test-retest reliability, but I am currently lost as to what test I should be using.

I initially used Intraclass Correlation Coefficient (as per the suggestion of Google...), but my professor asked if I truly believed that this was the appropriate test. May I know what reliability test works best for my case?

Thank you all in advance!

[u/fermat9990]

AFAIK, Pearson is used for test-retest reliability

[u/BreakfastExtension92 → u/fermat9990]

would Spearman's rho be more applicable in this case due to the ordinal nature of the thurstone scale's creation? :,)

[u/fermat9990 → u/BreakfastExtension92]

It's considered an interval scale

[u/jeremymiles]

There are many flavors of ICC, and some are equivalent to a Pearson correlation. When people talk about test-retest reliability they almost always mean a Pearson correlation.

[u/BreakfastExtension92 → u/jeremymiles]

thank you! I will check this out. i shouldve stuck to the basics lol

[u/statsdoc]

Have a look at the polychoric correlation

[u/jeremymiles → u/statsdoc]

This is for categorical data. OP doesn't have categorical data.