MLR Y randomization

This test is performed to check the robustness of the QSAR model by building several random models via shuffling the dependent variables, while keeping the independent variables as it is. The resultant random models are expected to have significantly low r^2 and q^2 values for several trials, to pass the test. Another parameter, cRp^2 is also calculated, which should be more then 0.5 for passing this test.