Hey guys i've been reading from this forum a lot lately and finally decided to make an account. I've been looking at a lot of NBA stats and i would like to know how to see if a system works with backtesting i've been looking at trends and the system seems to be profitable in the last 100 games or so but i would like to test it with a bigger sample size. I've been seeing if the system works on a game per game basis until now and i would like to know of a way to analyze the system on the games of the past 5-10 years to have a better idea of the real value of the system. I have excel if that's needed. I'll give points to whoever can help.