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Walter Johnson

Stat Geek Baseball New Stat Definitions


PEVA - Player Rating (Performance Evaluation Value) is a yearly comparison grade for each position player and pitcher, using six categories (and sub-categories) to value the overall statistical performance of the player in the year. Compares players against other players performance in a peer to peer era review.

RAVE - Three year Rolling Average. The rolling average value of a PEVA set of years. Utilized comparing the last three years (50%/30%/20%) versus the three years prior.

SPRO RAVE - An average value of PEVA over the last four years, accounting for the reach back tendency for players with past success. Utilized with Free Agent service time and EXPEQ players above a certain regular RAVE value when valuing contracts. Current baseball practices as of 2011 have changed this from the previous calculations using higher percentage values for the maximum year and lower percentage values for the minimum year.

FV - Field Value. Calculated as the Fielding Value of a Position Player combining the grades of various categories, including Innings or Games Played, Fielding Percentage, Range Factor, Catcher Caught Stealing Percentage, and Outfield Assists per 9 Innings Played (or Games). Peer to peer review per individual season with maximum value given to maximum player and comparative values to players below maximum compared to average levels.

EXPEQ - Experience Equivalent. A yearly and cumulative value for a player, utilizing Games Played, Innings Pitched, and Plate Appearances compared to number of team games. Used as quotient comparable to Major League Service Time (MLST) in both years prior to MLST and during the period of MLST use. Format of Years.Percentage of Years. EXPEQ is used to calculate SPRO numbers.

SPRO - Salary Projections utilizing the Baseball Evaluation decision model statistics. Calculated off of RAVE, SPRO RAVE, EXPEQ, and other comparable statistics.

Note: All Baseball Evaluation Stats were developed by JDP Econ & are the proprietary property of JDP ECON, statgeekbaseball.com, and baseballevaluation.com. All rights reserved. If any of the Baseball Evaluation stats are used in articles, etc., please credit baseballevaluation.com or statgeekbaseball.com.

Baseball Stat Definitions

Troy Tulowitski

Standard Baseball Stat Definitions


MLST - Major League Service Time. Calculated each year to determine the length of service, years of arbitration, and eligibility for Free Agency. MLST is calculated on a 172 day per year basis in the format of Year.Days. A player may get up to 1.000 years of credit per year. Arbitration begins at 3.000 (with the top % of Super Two players also eligible). Free agency begins at year 6.000.

G or GP - Games Played. The number of games in which a player or pitcher played during the season or career.

GS - Games Started. The number of games a pitcher or player was in the starting lineup.

IP - Innings Pitched. Number of Innings Pitched during the year or career. Format of Innings plus percentage of inning.

ERA - Earned Run Average. The number of earned runs given up per 9 innings pitched.

WHIP9 - Walks and HIts Per 9 Innings PItched. Walks plus hits allowed per 9 innings pitched. Often formatted as WHIP (per 1 inning pitched).

W - Wins. Number of wins in a season. Calculated for starting pitcher as leading when leaving the game after at least five innings with the lead maintained until the end of the game. For relief pitcher, predominantly given to the pitcher who is the pitcher in the game when the winning run is scored.

SV - Saves. Number of saves in a season. Statistic given to a relief pitcher who finishes a game after entering with a lead of no more than three runs, pitching with the winning run on deck, or pitching three innings, and maintaining the lead.

SO/W Ratio - Strikeout to Walk Ratio. Calculated as Strikeouts Divided by Walks.

HR9IP Ratio - Home Runs Per 9 Innings Pitched Ratio. The number of Home Runs given up by a pitcher per 9 Innings Pitched.

PA - Plate Appearances. The total number of plate appearances during a season or career by a batter. Includes At Bats, Walks, Hit By Pitch, Sacrifice Fly, and Sacrifices.

RPR - Run Production. The number of Runs Scored and Runs Batted In during a season.

SLG - Slugging Percentage. The percentage of Total Bases to At Bats.

OBP - On Base Percentage. The percentage of Hits plus Walks to Plate Appearances.

PF - Park Factor. Adjusting factor for the park played in, comparing statistics of the home and away performances of a team. Can be compiled utilizing various different factors. Baseball Evaluation uses the Park Factors (3 Year Adjusted, if Available) from the Sean Lahman Database & Baseball Databank.

OPS - On Base/Slugging. Popular current measurement adding Slugging Percentage and On Base Percentage. Also using OPS+ comparing OPS to league average.

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PEVA Player Ratings Boxscore

Fantastic - 32.000 (MVP, Cy Young Candidate)
Great - 20.000
Very Good - 15.000 (All-Star Caliber)
Good - 10.000
Average - 3.500

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