Fig. 1From: Conditional permutation importance revisitedPermutation scheme for the original PI (left) and for the CPI (right). In the permutation scheme of the original PI (left) the values of Xk are permuted against both Y and Z(−k). In the permutation scheme of the CPI (right) the values of Xk are permuted against Y conditionally on the values of Z(−k)Back to article page