Please help. I need a basic formula to calculate the success ratio of a given recommendation among a set of possible recommendations for a given scenario. For example, if I know that there are 10 possible recommendations for a given problem how would know the % of success for each recommendation given I know the # of times it has worked in the past (for that particular scenario), how many times it was wrong, AND (here's where I struggle) how many times it was a possible recommendation but was neither right or wrong. It seems basic, but I can't figure it out. Any help is greatly appreciated!