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  2. Symmetric mean absolute percentage error - Wikipedia

    (200% for the first formula and 100% for the second formula). Provided the data are strictly positive, a better measure of relative accuracy can be obtained based on the log of the accuracy ratio: log( F t / A t ) This measure is easier to analyse statistically, and has valuable symmetry and unbiasedness properties.

  3. Slugging percentage - Wikipedia

    In baseball statistics, slugging percentage (SLG) is a measure of the batting productivity of a hitter.It is calculated as total bases divided by at bats, through the following formula, where AB is the number of at bats for a given player, and 1B, 2B, 3B, and HR are the number of singles, doubles, triples, and home runs, respectively:

  4. Margin of error - Wikipedia

    For a confidence level, there is a corresponding confidence interval about the mean , that is, the interval [, +] within which values of should fall with probability . ...

  5. On-base percentage - Wikipedia

    History. The statistic was invented in the late 1940s by Brooklyn Dodgers statistician Allan Roth with then-Dodgers general manager Branch Rickey. In 1954, Rickey, who was then the general manager of the Pittsburgh Pirates, was featured in a Life Magazine graphic in which the formula for on-base percentage was shown as the first component of an all-encompassing "offense" equation.

  6. Body fat percentage - Wikipedia

    In males, mean percentage body fat ranged from 23% at age 16–19 years to 31% at age 60–79 years. In females, mean percentage body fat ranged from 32% at age 8–11 years to 42% at age 60–79 years. But it is important to recognise that women need at least 9% more body fat than men to live a normal healthy life.

  7. On-base plus slugging - Wikipedia

    Despite its simple calculation, OPS is a controversial measurement. OPS weighs on-base percentage and slugging percentage equally. However, on-base percentage correlates better with scoring runs. Statistics such as wOBA build on this distinction using linear weights. Additionally, the components of OPS are not typically equal (league-average ...

  8. Relative change and difference - Wikipedia

    Percentage change. A percentage change is a way to express a change in a variable. It represents the relative change between the old value and the new one. For example, if a house is worth $100,000 today and the year after its value goes up to $110,000, the percentage change of its value can be expressed as

  9. Root-mean-square deviation - Wikipedia

    Formula. The RMSD of an estimator ^ with respect to an estimated parameter is defined as the square root of the mean square error: ⁡ (^) = ⁡ (^) = ⁡ ((^)). For an unbiased estimator, the RMSD is the square root of the variance, known as the standard deviation.