Hello Everyone,
I have been researching on the quality metrics been used by SAP PA. and Predictive Power (Ki) model performance metric.' Ki 'which is quality metrics is actually Somers'd . But why it has been used ?
Predictive Power (Ki) corresponds to the proportion of information contained in the target variable that the explanatory variables are able to explain.
Somers' delta is a nonparametric measure of the strength and direction of association that exists between an ordinal dependent variable and an ordinal independent variable.
It is not confirmed that all the variable will ordinal ??
Can anyone have an explanation why this quality metric is been used ?