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I have two ordinal variables. One is independent and the other one is dependent variable. I would like to test if there is monotonic relationship between these two or not. I am using Somers' d measure in SPSS.
Now to use Somers' d measure, does it matter if more than 20% of the cells have expected frequencies below five?
I think this assumption only applies to the Chi-square test for the nominal by ordinal variables or two nominal variables. I am not 100% sure!

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  • $\begingroup$ Does each specimen get a rank or get categorized into an ordinal scale? If the first, then @Lan's suggestion of the Spearman makes sense. If the second, then something like Somer's D is more appropriate. $\endgroup$
    – Ashe
    Mar 22 '16 at 18:58
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Why do you not compute Spearman's rank correlation coefficient?

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