Baseball Prospectus Glossary

Value Over Replacement Player. The number of runs contributed beyond what a replacement-level player at the same position would contribute if given the same percentage of team plate appearances. VORP scores do not consider the quality of a player's defense.

See also RARP.

VORP rate. Runs/game contributed beyond what a replacement level player would produce. Also a rate stat.

As listed in a player's PECOTA card, a series of metrics designed to evaluate a player's value to his team going forward. See individual entries for detail.

Named for Tom Verducci of Sports Illustrated, this is a negative forward indicator for pitcher workload. Verducci, who called this the 'Year After Effect,' found that pitchers under the age of 25 who have 30-inning increases year over year tend to underperform. Will Carroll independently found that pitchers who break the "Rule of 30" tend to get injured. Carroll renamed this 'rule' the Verducci Effect in honor of the man who initially found the evidence.