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  2. Relative change and difference - Wikipedia

    In general, the term "percentage point(s)" indicates an absolute change or difference of percentages, while the percent sign or the word "percentage" refers to the relative change or difference. Examples Comparisons. Car M costs $50,000 and car L costs $40,000. We wish to compare these costs. With respect to car L, the absolute difference

  3. Deviation (statistics) - Wikipedia

    In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean. The sign of the deviation reports the direction of that difference (the deviation is positive when the observed value exceeds the reference value). The magnitude of the value indicates ...

  4. Chemical formula - Wikipedia

    An example of the difference is the empirical formula for glucose, which is CH 2 O (ratio 1:2:1), while its molecular formula is C 6 H 12 O 6 (number of atoms 6:12:6). For water, both formulae are H 2 O. A molecular formula provides more information about a molecule than its empirical formula, but is more difficult to establish.

  5. Ecological efficiency - Wikipedia

    In comparing the cultivation of animals versus plants, there is a clear difference in magnitude of energy efficiency. Edible kilocalories produced from kilocalories of energy required for cultivation are: 18.1% for chicken, 6.7% for grass-fed beef, 5.7% for farmed salmon, and 0.9% for shrimp.

  6. 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.

  7. Mass–energy equivalence - Wikipedia–energy_equivalence

    The difference between the two masses is called the mass defect and is related to the binding energy through Einstein's formula. [30] [31] [32] The principle is used in modeling nuclear fission reactions and it implies a great amount of energy can be released by the nuclear fission chain reactions used in both nuclear weapons and nuclear power .

  8. 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:

  9. 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 . ...