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2-point field goal percentage; the formula is 2p / 2pa. 3p 3-point field goal percentage (available since the 1979-80 season in the nba); the formula is 3p / 3pa. 3pa age drb defensive rating (available since the 1977-78 season in the nba); for players and teams it is points allowed per 100 posessions. this rating was developed by dean oliver, author of basketball on paper. i will point you to dean's book for complete details. field goal percentage; the formula is fg / fga. four factors most valuable player mov opponent orb% player efficiency rating (available since the 1951-52 season); per is a rating developed by espn.com columnist john hollinger. in john's words, "the per sums up all a player's positive accomplishments, subtracts the negative accomplishments, and returns a per-minute rating of a player's performance." please see the article calculating per for more information. also see vaa and var. possessions (available since the 1973-74 season in the nba); the formula for teams is 0.5 * ((tm fga + 0.4 * tm fta - 1.07 * (tm orb / (tm orb + opp drb)) * (tm fga - tm fg) + tm tov) + (opp fga + 0.4 * opp fta - 1.07 * (opp orb / (opp orb + tm drb)) * (opp fga - opp fg) + opp tov)). this formula estimates possessions based on both the team's statistics and their opponent's statistics, then averages them to provide a more stable estimate. the formula for players is rather lengthy and can be found in dean oliver's book. trb% w wins pythagorean wins; the formula is g * (tm pts14 / (tm pts14 + opp pts14)). the formula was obtained by fitting a logistic regression model with log(tm pts / opp pts) as the explanatory variable. using this formula for all baa, nba, and aba seasons, the root mean-square error (rmse) is 3.14 wins. using an exponent of 16.5 (a common choice), the rmse is 3.48 wins. (note: an exponent of 10 is used for the wnba.) win shares per 48 minutes (available since the 1951-52 season in the nba); an estimate of the number of wins contributed by the player per 48 minutes (league average is approximately 0.100). please see the article calculating win shares for more information. the estimated probability that team a will defeat team b in a given matchup. year.

2-point field goals drb defensive rebound percentage (available since the 1970-71 season in the nba); the formula is 100 * (drb * (tm mp / 5)) / (mp * (tm drb + opp orb)). defensive rebound percentage is an estimate of the percentage of available defensive rebounds a player grabbed while he was on the floor. free throw percentage; the formula is ft / fta. fta gb games started (available since the 1982 season) most valuable player orb offensive rebounds (available since the 1973-74 season in the nba) offensive rebound percentage (available since the 1970-71 season in the nba); the formula is 100 * (orb * (tm mp / 5)) / (mp * (tm orb + opp drb)). offensive rebound percentage is an estimate of the percentage of available offensive rebounds a player grabbed while he was on the floor. ows points produced; dean oliver's measure of offensive points produced. please see dean's book for details. roy smoy sos simple rating system; a rating that takes into account average point differential and strength of schedule. the rating is denominated in points above/below average, where zero is average. my colleague doug drinen of pro-football-reference.com has written a great explanation of this method. team usage percentage (available since the 1977-78 season in the nba); the formula is 100 * ((fga + 0.44 * fta + tov) * (tm mp / 5)) / (mp * (tm fga + 0.44 * tm fta + tm tov)). usage percentage is an estimate of the percentage of team plays used by a player while he was on the floor..

3-point field goals (available since the 1979-80 season in the nba) 3pa drtg dws effective field goal percentage; the formula is (fg + 0.5 * 3p) / fga. this statistic adjusts for the fact that a 3-point field goal is worth one more point than a 2-point field goal. for example, suppose player a goes 4 for 10 with 2 threes, while player b goes 5 for 10 with 0 threes. each player would have 10 points from field goals, and thus would have the same effective field goal percentage (50%). fg ft% free throw attempts games behind; the formula is ((first w - w) + (l - first l)) / 2, where first w and first l stand for wins and losses by the first place team, respectively. losses mvp most valuable player per 36 minutes smoy sixth man of the year steals (available since the 1973-74 season in the nba) steal percentage (available since the 1973-74 season in the nba); the formula is 100 * (stl * (tm mp / 5)) / (mp * opp poss). steal percentage is an estimate of the percentage of opponent possessions that end with a steal by the player while he was on the floor. stops; dean oliver's measure of individual defensive stops. please see dean's book for details. w-l% ws.