Empirical Rule

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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  • 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

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  • 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

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  • 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

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