Empirical Rule

A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean. Broken down, the empirical rule shows that 68% will fall within the first standard deviation, 95% within the first two standard deviations, and 99.7% will fall within the first three standard deviations of the mean.

Also referred to as the Three Sigma Rule, or the 68-95-99.7 Rule.

The Empirical Rule is most often used in statistics for forecasting final outcomes. After a standard deviation is calculated, and before exact data can be collected, this rule can be used as a rough estimate as to the outcome of the impending data. This probability can be used in the meantime as gathering appropriate data may be time consuming, or even impossible to obtain.


Investment dictionary. . 2012.

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  • empirical rule — empirinė taisyklė statusas T sritis automatika atitikmenys: angl. empirical rule; rule of thumb vok. empirische Regel, f; Faustregel, f rus. практическое правило, n; эмпирическое правило, n pranc. règle empirique, f …   Automatikos terminų žodynas

  • empirical rule — noun That a normal distribution has 68% of its observations within one standard deviation of the mean, 95% within two, and 99.7% within three. Syn: 68–95–99.7 rule …   Wiktionary

  • rule of thumb — empirinė taisyklė statusas T sritis automatika atitikmenys: angl. empirical rule; rule of thumb vok. empirische Regel, f; Faustregel, f rus. практическое правило, n; эмпирическое правило, n pranc. règle empirique, f …   Automatikos terminų žodynas

  • Empirical formula — Formula For mu*la, n.; pl. E. {Formulas}, L. {Formul[ae]}. [L., dim. of forma form, model. See{Form}, n.] 1. A prescribed or set form; an established rule; a fixed or conventional method in which anything is to be done, arranged, or said. [1913… …   The Collaborative International Dictionary of English

  • Abegg's rule — Empirical rule that the solubility of salts of alkali metals with strong acids decreases from lithium to caesium, i.e., with increase of relative atomic mass, and those with weak acids follow the opposite order. Sodium chloride is an exception to …   Dictionary of automotive terms

  • 68-95-99.7 rule — The 68 95 99.7 rule, or three sigma rule, or empirical rule, states that for a normal distribution, almost all values lie within 3 standard deviations of the mean.About 68% of the values lie within 1 standard deviation of the mean (or between the …   Wikipedia

  • Gnevyshev-Ohl rule — The Gnevyshev Ohl rule is an empirical rule according to which the sum of sunspot numbers over an odd cycle exceeds that of the preceding even cycle. See Gnevishev M.N., Ohl A.I., 1948: About 22 year cycle of solar activity. Astronomical Journal …   Wikipedia

  • 68–95–99.7 rule — noun That a normal distribution has 68% of its observations within one standard deviation of the mean, 95% within two, and 99.7% within three. Syn: empirical rule …   Wiktionary

  • Dühring's rule — noun An empirical rule stating that a linear relationship exists between the temperatures at which two solutions exert the same vapor pressure. See Also: Dührings plot …   Wiktionary

  • Majority rule — Majority Rules redirects here. For Canadian comedy show, see Majority Rules!. Part of the Politics series Electoral methods …   Wikipedia

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