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  2. Performance rating (chess) - Wikipedia

    en.wikipedia.org/wiki/Performance_rating_(chess)

    An equivalent way to calculate this performance rating is by taking the average of opponent's rating + 400 for each win; opponent's rating - 400 for each loss; just their rating for each draw. A disadvantage becomes obvious: An additional win against a low-rated player can actually lower your performance rating.

  3. Elo rating system - Wikipedia

    en.wikipedia.org/wiki/Elo_rating_system

    A player whose rating is 100 points greater than their opponent's is expected to score 64%; if the difference is 200 points, then the expected score for the stronger player is 76%. [2] A player's Elo rating is a number that may change depending on the outcome of rated games played. After every game, the winning player takes points from the ...

  4. Precision and recall - Wikipedia

    en.wikipedia.org/wiki/Precision_and_recall

    In a classification task, the precision for a class is the number of true positives (i.e. the number of items correctly labelled as belonging to the positive class) divided by the total number of elements labelled as belonging to the positive class (i.e. the sum of true positives and false positives, which are items incorrectly labelled as belonging to the class).

  5. Player efficiency rating - Wikipedia

    en.wikipedia.org/wiki/Player_efficiency_rating

    A three point field goal made is worth 2.65 points. A missed field goal, though, costs a team 0.72 points. Given these values, with a bit of math we can show that a player will break even on his two point field goal attempts if he hits on 30.4% of these shots. On three pointers the break-even point is 21.4%.

  6. Teens are using 'aura points' to calculate coolness. The ...

    www.aol.com/lifestyle/teens-using-aura-points...

    Points were accrued by acting mysterious in the hallway (+2500 points), executing the perfect dap up (+755 points) and tripping but saving it (+10,000,000 points).

  7. Percentile rank - Wikipedia

    en.wikipedia.org/wiki/Percentile_rank

    Percentile ranks (PR) for a distribution of 10 scores. In statistics, the percentile rank (PR) of a given score is the percentage of scores in its frequency distribution that are less than that score. [1]

  8. Chess piece relative value - Wikipedia

    en.wikipedia.org/wiki/Chess_piece_relative_value

    In chess, a relative value (or point value) is a standard value conventionally assigned to each piece. Piece valuations have no role in the rules of chess but are useful as an aid to evaluating a position. The best-known system assigns 1 point to a pawn, 3 points to a knight or bishop, 5 points to a rook and 9 points to a queen. Valuation ...

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