In this present book Chapter-I is an introductory one. In Chapter - II, a careful observation has been made on relative importance of explanatory variable in multiple regression employing partial standardization technique. In Chapter - III, Method of path analysis has been employed to trace out the variable importance of maternal anthropometric indicators on pregnancy outcome. In Chapter - IV, The study of variable importance has been generated in the light of logistic regression employing the study of second cancer and its risk factors. In Chapter - V, a few machine learning techniques such...