Sigma vs. Variance — What's the Difference?

Sigma (uppercase Σ, lowercase σ, lowercase in word-final position ς; Greek: σίγμα) is the eighteenth letter of the Greek alphabet. In the system of Greek numerals, it has a value of 200.

In probability theory and statistics, variance is the expectation of the squared deviation of a random variable from its mean. Variance is a measure of dispersion, meaning it is a measure of how far a set of numbers is spread out from their average value.

The 18th letter of the Greek alphabet. See Table at alphabet.

The fact or quality of being different, divergent, or inconsistent

A sigma factor.

An official dispensation from a rule or regulation, typically a building regulation.

(Statistics) The standard deviation of a given probability distribution or a given set of data.

The state or quality of being variant or variable; variation

The eighteenth letter of the Classical and Modern Greek alphabets, the twentieth letter of Old and Ancient.

Difference or inconsistency

(mathematics) The symbol Σ, used to indicate summation of a set or series.

The state or fact of being in disagreement or in conflict

(statistics) The symbol σ, used to indicate one standard deviation from the mean, particularly in a normal distribution.

A discrepancy between two statements or documents, especially between the charge in a criminal indictment and the evidence presented.

Clipping of sigma male

An exception to the application of a usual rule, granted by an authority on the basis of hardship or practicality

The Greek letter

(Statistics) The square of the standard deviation.

The 18th letter of the Greek alphabet

(Chemistry) The number of thermodynamic variables, such as temperature and pressure, required to specify a state of equilibrium of a system, given by the phase rule; the degrees of freedom of a system.

The act of varying or the state of being variable.

A difference between what is expected and what is observed; deviation.

The state of differing or being in conflict.

An official permit to do something that is ordinarily forbidden by regulations.

(law) A discrepancy between two legal documents.

(law) A departure from a cause of action originally in a complaint.

(statistics) The second central moment in probability.

The number of degrees of freedom in a system.

Covariance and contravariance generally.

The quality or state of being variant; change of condition; variation.

Difference that produces dispute or controversy; disagreement; dissension; discord; dispute; quarrel.

A disagreement or difference between two parts of the same legal proceeding, which, to be effectual, ought to agree, - as between the writ and the declaration, or between the allegation and the proof.

The expected value of the square of the deviation from the mean of a randomly distributed variable; the second moment about the mean. This is also the square of the standard deviation.

An event that departs from expectations

Discord that splits a group

The second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value

A difference between conflicting facts or claims or opinions;

The quality of being subject to variation

An activity that varies from a norm or standard;