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What is the difference between Cohen's $\kappa$ and Spearman's $\rho$?

ChriBa
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  • Welcome to CV! I wonder if this question [essentially duplicates this one](http://stats.stackexchange.com/q/3539/22228)? – Silverfish Oct 22 '15 at 22:49

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Cohen's $\kappa$ can only be used for qualitative variables, whereas Spearman's $\rho$ can be generalized to both qualitative and quantitative variables. It also seems like Spearman's $\rho$ has a defined and frequently-used hypothesis test associated with it (using the Fisher transformation, $\rho$ will be approximately Normally distributed) whereas Cohen's $\kappa$ appears to have some problems/hesitation associated with it.

Matt Brems
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