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Statistics in basketball are kept to evaluate a player or a team's performance.
Some statistics are
Averages per game are denoted by *PG (e.g. BLKPG or BPG, STPG or SPG, APG, RPG and MPG). Sometime the players statistics are divided by minutes played and multiplied by 48 minutes (had he played the entire game), denoted by * per 48 min. or *48M.
A player who makes double digits in a game in any two of the PTS, REB, AST, STL, and BLK statistics is said to make a double double; in three statistics, a triple double; in four statistics, a quadruple double. A quadruple double is extremely rare (and has only occurred four times in the NBA). There is also a 5x5, when a player records at least a 5 in each of the 5 statistics.
The NBA also posts to the statistics section of its Web site a simple composite efficiency statistic, denoted EFF and derived by the formula, ((Points + Rebounds + Assists + Steals + Blocks) − ((Field Goals Attempted − Field Goals Made) + (Free Throws Attempted − Free Throws Made) + Turnovers)). While conveniently distilling most of a players key statistics in one numerical score, the formula is not highly regarded by the statistics community, with the alternative Player Efficiency Rating developed by ESPN basketball statistician John Hollinger being more widely used to compare the overall efficiency of players.
Lovers of basketball statistics often enjoy comparing dozens of more arcane statistics, many of which show how well a player works within the team context. Continually updated databases hosted by Web sites can generate sortable charts and graphs in an interactive fashion. A few clicks can show, for example, who among shooting guards gets blocked the most per shot attempt, or who leads a particular team in any given category.