Value over replacement player
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In baseball, value over replacement player (or VORP) is a statistic invented by Keith Woolner that demonstrates how much a hitter contributes offensively or how much a pitcher contributes to his team in comparison to a fictitious "replacement player," who is an average fielder at his position and a below average hitter.[1] [2] A replacement player performs at "replacement level," which is the level of performance an average team can expect when trying to replace a player at minimal cost, also known as "freely available talent."
VORP's usefulness is in the fact that it measures contribution at the margin (as in marginal utility). Other statistics compare players to the league average, which is good for cross-era analysis (example: 90 runs created in 1915 are much better than 90 RC in 1996, because runs were more scarce in 1915). League-average comparisons break down, however, when considering a player's total, composite contribution to a team. Baseball is a zero-sum game; in other words, one team can only win if another loses. A team wins by scoring more runs than its opponent. It follows, then, that a contribution of any runs helps a team toward a win, no matter how small the contribution. However, the Major Leagues are highly competitive, and talent distribution in baseball does not resemble normal distribution's traditional "bell curve"; rather, the majority of players fall within the category of "below-average" or worse. Therefore, the so-called "average player" does not have a value of zero, like in Pete Palmer's Total Player Rating, but instead is a valued commodity. One alternative is to rank players using "counting stats" -- simply their gross totals -- but this is unacceptable as well, since it is likely that the contribution a marginal player makes, even if it does help a team win one game, is not enough to justify his presence in the Majors. This is where the concept of the replacement level enters the picture.
The currency of baseball is the out. There is a finite number of outs that a team can make in one game, and it is almost always 27 (or 3 outs/inning * 9 innings/game). A player consumes these outs to create runs, and at the simplest level, runs and outs are the only truly meaningful stats in baseball. Outs are calculated by simply taking at-bats and subtracting hits, then adding in various outs that don't count toward at-bats: caught stealing, sacrifices, etc. Runs may be estimated by one of many run-approximation methods: Bill James' runs created, Palmer's linear weights, equivalent runs, etc.; Baseball Prospectus author Keith Woolner, who invented VORP, prefers to use runs created in his VORP calculations. Armed with runs and outs (for the player and that player's league), one can finally calculate VORP.
It should be noted at this point that critics of VORP take issue with where the formula's arbitrary "replacement level" is set. Many equations and methods exist for finding the replacement level, but most will set the level somewhere around 80% of the league average, in terms of runs per out. There are two exceptions to this, though: catchers, who shoulder a larger defensive responsibility than any other player in the lineup (and are therefore more scarce), have a replacement level at 75% of the league average. At the other end of the defensive spectrum, first basemen and designated hitters must produce at a level above 85% of the average to be considered better than "replacement level," since defense is not a big consideration at either position (it's actually not a consideration at all for the DH).
Therefore, to calculate VORP one must multiply the league's average runs per out by the player's total outs; this provides the number of runs an average player would have produced given that certain number of outs to work with. Now multiply that number (of runs) by .8, or whatever percentage of average the replacement level is designated to be; the result is the number of runs you could expect a "replacement player" to put up with that number of outs. Simply subtract the replacement's runs created from the player's actual runs created, and the result is VORP. This is not the final adjustment, however: while the replacement's run total will be park-neutral (by definition, because replacement numbers are derived from league averages), the player's raw numbers won't be. Before calculating the VORP, the individual player stats must be normalized via park factors to eliminate the distortions that can be created by each ballpark, especially extreme parks like Coors Field in Denver (where the thin mountain air allows baseballs to travel further than at sea level) and Petco Park in San Diego (where the heavier sea air couples with distant fences to suppress run-scoring). After the final adjustment, the resultant VORP may be used to estimate how "valuable" the player in question is by providing a good picture of that player's marginal utility.
