Hi everybody!!!
I'm here again with my doubts!!!

I'm making calculations about Offensive Rating and Defensive Rating aplying Dean Oliver's formulas. With Offensive Rating I haven't any doubt but with Defensive Rating ... I've got strange results in some cases. I'm applying the formula just only for a game right now, so ... ¿is it possible that I've got strange results because I'm making calulations for only one game? The strange result is that I've got a negative defensive rating with a player that only play two minutes. I have revised the formula several times, and all the intermedia calculations are right but the negative result occurs when I calculate the last step:
DRtg = Team_Defensive_Rating + 0.2 * (100 * D_Pts_per_ScPoss * (1 - Stop%) - Team_Defensive_Rating
So, what can I do in this cases? I mean, what is the more elegant solution to show in this cases? Show a negative value? Convert negative values to zero? Don't show anything?
And my second question about Offensive Rating and Defensive Rating is ... When I will make calculations to get the Offensive Rating or Defensive Rating about 5, 10, 20 games or all a regular season. What is better ... to sum all the Offensive Rating and Defensive Rating of each game and get the average or apply the formulas to all the games? I guess is the second option, but I would like to know how do you work in this cases if you previously have all the Offensive Rating and Defensive Rating previously calculated by game.
That's all!!! Thanks in advance for your appreciated help!!!