Spearman's rho is a special case of the product-moment r. As such, a principal components analysis of inter-rater rhos among k raters on n cases may be performed. The size of the first principal component is proportional to the amount of inter-rater agreement and can be equated to Kendall's W. The principal components procedure can also reveal the presence of differing rating policies and can isolate subgroups of raters.
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