Carols later on to travel they don't understand then I start reading papers scientific papers to to get more insights about why things are working or not you have a question can you talk a little bit more about what is the use of fitting base models for example linear or logistic regression and using them as in input to more sophisticated model so the question is in the last exam that I will show you why did I use the linear regression models and why I used them in my life GB model so because we had that trend of