From the manual.

"PB Value: Refers to the relative value of players according to criteria set by PureBaseball staff. Offensive players are rated by their OPS (sum of on base plus slugging percentage) relative to their actual home park and the position they play."


So PB value is just a players score. The key being that it is derived from adjusted offensive numbers. Thus an adjustment is being done. The key is if that adjustment is properly being used for the games being played.

P.S. You think anyone reads this?