Models Building models is a major activity for statisticians econometricians and other scientists a model is a global summary of relationships between variables, which both helps to understand phenomenons and allows predictions dM is not concerned with estimation and tests off prespecified models but with discovering models through an algorithmic search process exploring linear and non linear models explicit or not: neural networks, decision trees, Support Vector Machines logistic regression, graphical models etc In DM Models do not come from a theory but from data exploration Beijing, 2008 9Beijing, 2008 9 Models ◼ Building models is a major activity for statisticians econometricians, and other scientists. A model is a global summary of relationships between variables, which both helps to understand phenomenons and allows predictions. ◼ DM is not concerned with estimation and tests, of prespecified models, but with discovering models through an algorithmic search process exploring linear and non-linear models, explicit or not: neural networks, decision trees, Support Vector Machines, logistic regression, graphical models etc. ◼ In DM Models do not come from a theory, but from data exploration