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  2. Fold change - Wikipedia

    en.wikipedia.org/wiki/Fold_change

    Here, fold change is defined as the ratio of the difference between final value and the initial value divided by the initial value. For quantities A and B, the fold change is given as (B − A)/A, or equivalently B/A − 1. This formulation has appealing properties such as no change being equal to zero, a 100% increase is equal to 1, and a 100% ...

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or ⁠ ⁠, where a and b are both integers. [ 9] As with other fractions, the denominator ( b) cannot be zero. Examples include ⁠ 1 2 ⁠, − ⁠ 8 5 ⁠, ⁠ −8 5 ⁠, and ⁠ 8 −5 ⁠.

  4. Percentile - Wikipedia

    en.wikipedia.org/wiki/Percentile

    Percentile. In statistics, a k-th percentile, also known as percentile score or centile, is a score below which a given percentage k of scores in its frequency distribution falls (" exclusive " definition) or a score at or below which a given percentage falls (" inclusive " definition). Percentiles are expressed in the same unit of measurement ...

  5. Relative risk - Wikipedia

    en.wikipedia.org/wiki/Relative_risk

    Relative risk is used in the statistical analysis of the data of ecological, cohort, medical and intervention studies, to estimate the strength of the association between exposures (treatments or risk factors) and outcomes. [ 2] Mathematically, it is the incidence rate of the outcome in the exposed group, , divided by the rate of the unexposed ...

  6. Division by zero - Wikipedia

    en.wikipedia.org/wiki/Division_by_zero

    Division by zero. The reciprocal function y = ⁠ 1 x⁠. As x approaches zero from the right, y tends to positive infinity. As x approaches zero from the left, y tends to negative infinity. In mathematics, division by zero, division where the divisor (denominator) is zero, is a unique and problematic special case.

  7. List of Christian denominations by number of members

    en.wikipedia.org/wiki/List_of_Christian...

    A map of Catholicism by population percentage. Catholicism is the largest branch of Christianity and the Catholic Church is the largest among churches. About 48.6% to 50.1% of all Christians are Catholics. [1] [2] According to the annual directory of the Catholic Church or Annuario Pontificio of 2024, there were 1.390 billion baptized Catholics ...

  8. f-number - Wikipedia

    en.wikipedia.org/wiki/F-number

    Thus to find the ratio of a lens of 2 inches diameter and 6 inches focus, divide the focus by the aperture, or 6 divided by 2 equals 3; i.e., 1 ⁄ 3 is the intensity ratio. [ 22 ]

  9. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    For example, the decimal representation of ⁠ 1 / 3 ⁠ becomes periodic just after the decimal point, repeating the single digit "3" forever, i.e. 0.333.... A more complicated example is ⁠ 3227 / 555 ⁠ , whose decimal becomes periodic at the second digit following the decimal point and then repeats the sequence "144" forever, i.e. 5. ...