For the cumulative link model, G−1[P(yi ≤ j)] = ????j + xi????, show that for 1 ≤ j < k ≤ c − 1, P(yi ≤ k) equals P(yi ≤ j) at x∗, where x∗ is obtained by increasing component h of xi by (????k − ????j)∕????h for each h. Interpret.