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When to use the Spearman Correlation test
What does the Speaman Correlation measure?
- The Spearman correlation (denoted as p (rho) or rs) measures the strength and direction of association between two ranked variables.
- It is most commonly used to measure the degree and direction of a linear relation between two variables that are of the ordinal type.
What are the assumptions of the Spearman Correlation test?
- two variables that are either ordinal, interval or ratio (note: if the data are interval or ratio, normally you would use a Pearson correlation test)
- the relationship between the variables is monotonic, or (curvi)linear
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