Determine whether y is monotonically correlated with x.
y is found increasing or decreasing with respect to x based on a Spearman correlation test.
The Spearman correlation coefficient is estimated from the data, and the sign of the resulting estimate is used as the result.
In the event that the 95% confidence interval based on Fisher transform spans zero, a warning is raised.
Fisher transformation. Wikipedia. https://en.wikipedia.org/wiki/Fisher_transformation
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