I had whole 3 sessions with Arghavan to this point, two for python and one particular for R. He is extremely clever and is aware what he is talking about. When you have a question and he would not know the answer, he will investigate and find you the answ... https://rylanknwzw.tkzblog.com/28074504/r-programming-help-online-things-to-know-before-you-buy