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  2. Relative change - Wikipedia

    en.wikipedia.org/wiki/Relative_change

    Relative change. In any quantitative science, the terms relative change and relative difference are used to compare two quantities while taking into account the "sizes" of the things being compared, i.e. dividing by a standard or reference or starting value. [1] The comparison is expressed as a ratio and is a unitless number.

  3. Symmetric mean absolute percentage error - Wikipedia

    en.wikipedia.org/wiki/Symmetric_mean_absolute...

    (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.

  4. Help:Displaying a formula - Wikipedia

    en.wikipedia.org/wiki/Help:Displaying_a_formula

    1) Later on, the text can refer to this equation by its number using syntax like this: As seen in equation ({{EquationNote|1}}), example text... The result looks like this: As seen in equation (1), example text... The equation number produced by {{ EquationNote }} is a link that the user can click to go immediately to the cited equation. Alphabets and typefaces See also: Wikipedia:LaTeX ...

  5. Cohen's kappa - Wikipedia

    en.wikipedia.org/wiki/Cohen's_kappa

    Cohen's kappa. Cohen's kappa coefficient ( κ, lowercase Greek kappa) is a statistic that is used to measure inter-rater reliability (and also intra-rater reliability) for qualitative (categorical) items. [1] It is generally thought to be a more robust measure than simple percent agreement calculation, as κ takes into account the possibility ...

  6. Relative volatility - Wikipedia

    en.wikipedia.org/wiki/Relative_volatility

    Relative volatility is a measure comparing the vapor pressures of the components in a liquid mixture of chemicals. This quantity is widely used in designing large industrial distillation processes. [1] [2] [3] In effect, it indicates the ease or difficulty of using distillation to separate the more volatile components from the less volatile ...

  7. Frequency (statistics) - Wikipedia

    en.wikipedia.org/wiki/Frequency_(statistics)

    Frequency (statistics) In statistics, the frequency or absolute frequency of an event is the number of times the observation has occurred/recorded in an experiment or study. [1] : 12–19 These frequencies are often depicted graphically or in tabular form.

  8. Haversine formula - Wikipedia

    en.wikipedia.org/wiki/Haversine_formula

    The haversine function computes half a versine of the angle θ, or the squares of half chord of the angle on a unit circle (sphere). To solve for the distance d, apply the archaversine ( inverse haversine) to h = hav (θ) or use the arcsine (inverse sine) function: or more explicitly: [9] This can be further transform to reduce some math ...

  9. Talk:Relative change and difference - Wikipedia

    en.wikipedia.org/wiki/Talk:Relative_change_and...

    In the first formula, if one of the values is fixed (let's say x = 5), then the largest relative difference is for y = -5 (d r = 2), whereas, e.g., y = -10 gives d r = 1.5 (the same as y = 1.25) The last formula (with the average of the absolute values) will always give 2 if x and y have different signs.