ExpRC indicates the number of runs a Replacement Player would have created given the same number of outs. This varies from position to position as typical firstbasemen create far more runs than do catchers or shortstops. CBR indicates a players range with 100 being average. Expected ZR varies from position to position The expected number of assists, putoffs and douple plays is dependant on the mackup of the pitching staff. Some pitching staffs have more lefthanders and groundballers than others.
Ballparks also have an effect.
Colorado OFs have very low RFs. The amount of times a player makes on out on a ball hit into his zone. The Average Margin of Victory is also high at this time, roughly 5.5. This varies slightly from team to team and between the leagues. There is no easy way to handle GDPs.