Differed and Variance

noun

• An event that departs from expectations.
  • synonyms: discrepancy, variant
• Discord that splits a group.
  • synonyms: division
• 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.
  • usage: "a growing divergence of opinion"
  • synonyms: discrepancy, disagreement, divergence
• The quality of being subject to variation.
  • synonyms: variability, variableness
• An official dispensation to act contrary to a rule or regulation (typically a building regulation. )
  • usage: "a zoning variance"
• An activity that varies from a norm or standard.
  • usage: "any variation in his routine was immediately reported"
  • synonyms: variation

• (n.) The quality or state of being variant; change of condition; variation.
• (n.) 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.
• (n.) Difference that produce dispute or controversy; disagreement; dissension; discord; dispute; quarrel.

Variance is a measure of volatility, risk, or statistical dispersion. It is the square of the standard deviation. The variance is calculated by: computing the mean of the series then taking the deviation or subtracting the mean from each observation, square the differences or deviations for each observation, and divide the sum of the squared deviations by the number of observations. This computation is the precursor to the standard deviation. The standard deviation is calculated by taking the square root of the variance.