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# Non-Parametric Statistics

## In Spearman correlation, variable values are converted in ranks and then correlated.

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## Non-Parametric Statistics

by CK-12 //advanced
This Concept introduces students to non-parametric situations, including the sign test and sign-rank test.
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## Wilcoxon Signed-Ranks Test

by CK-12 //advanced
Learn how to perform a Wilcoxon Signed-Rank Test to determine a difference in data using z-distribution and ranks given that the samples are not independent.
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