Wikipedia's entry on the Wilcoxon Signed Rank Test says that the test is "used to compare two related samples, matched samples, or repeated measurements." In contrast, The SAS documentation of the Wilcoxon Signed Rank Test references x_{i} (a data value) and its rank, r_{i} as though we only had a single variable. How do I interpret x_{i} from SAS' documentation when I have paired data?
Thank you!
See the second paragraph on that documentation page. As described there, to perform the test to compare paired samples, you create a single variable that is the difference within each pair. The x_i are those differences and the r_ are the ranks.
See the second paragraph on that documentation page. As described there, to perform the test to compare paired samples, you create a single variable that is the difference within each pair. The x_i are those differences and the r_ are the ranks.
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