I had total 3 sessions with Arghavan up to now, two for python and just one for R. He is incredibly good and is aware what he is talking about. For those who have an issue and he doesn't know the answer, he will study and find you the answ... https://devinolzgx.bloggazza.com/27694442/r-programming-project-help-things-to-know-before-you-buy