wilcoxTestTargetY function

Wilcoxon test to compare two mean squared error rates.

Used as a subroutine in InvariantTargetPrediction to test whether out-of-sample performance is better when using X and E as predictors for Y, compared to using X only.

wilcoxTestTargetY(Y, predictedOnlyX, predictedXE, verbose, ...)

Arguments

• Y: An n-dimensional vector.
• predictedOnlyX: Predictions for Y based on predictors in X only.
• predictedXE: Predictions for Y based on predictors in X and E.
• verbose: Set to TRUE if output should be printed.
• ...: Argument to allow for coherent interface of fTestTargetY and wilcoxTestTargetY.

Returns

A list with the p-value for the test.