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variance

variance

32 7.2
A measure of how much numbers are spread out from their average
  • noun
  • /ˈvɛrɪəns/
  • Specialized
: varianza
  • The variance in test scores indicated that some students performed much better than others.
  • analysis of variance
  • explained variance
  • variance accounted for

Like if we would proceed to directly fill this into wrenches, then the variance would be quite small.

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Examples

  • The final model accounted for 46% of the variance in scores for this subtest.

    Academic text (2015)
  • The overall language and vocabulary measures accounted for 48.6% of the variance in reading comprehension.

    Academic text (2013)
  • We will look at the variance of your total return.

  • So the bigger the variance, the farther away the numbers are from the mean.

  • OK, now we just want to compute what is the mean and variance of the portfolio.

  • So if we have the mean, the expected return, and then the variance is sort of how spread out all of the observations on average are from that.

  • Together with education, it accounted for 28.7% of the variance observed in the SRTSTAT scores.

    Academic text (2012)
  • Individual differences were explained by 86% of the total variance, a measure of predictive validity.

    Academic text (2008)
  • The variance of the data showed significant differences from the mean value.

  • In statistics, variance helps us understand how spread out the scores are from the average.

Synonyms

variation
vsvariance
113 3.0

A change in amount or condition from what is normal

is a precise numeric measure of dispersion using squared deviations from the mean
variability
vsvariance
29 5.7

The amount that something changes over time or between things

is a specific numeric measure of dispersion based on squared deviations

Antonyms

uniformity
  • Specialized
18 4.6

The state of being the same in all parts

Idioms

at variance
  • Formal
2 7.7

Not in agreement with other people, facts, or ideas

Compounds

analysis of variance
  • Specialized
1 5.8

A way to check if two or more groups have different average values

variance analysis
  • Specialized
6.2

Examining why actual costs are different from planned amounts to find causes

How Different

conflict
397 2.3
contradiction
117 4.3
discrepancy
76 5.6
inconsistency
30 4.8
difference
∞ 1.0
variance
  • Specialized
32 7.2

Surface Forms

variance singular
variances plural

Morphology

variance = vary (semi-transparent) = vari + ance

The statistical sense is a domain-specific technicalization of 'degree of variation' from 'vary' + '-ance'; the general relation is visible but the precise mathematical meaning is specialized.

Etymology

The word variance comes from the Latin root var- meaning 'change', the same root in vary and various. In statistics, a variance measures how much numbers 'vary' from the average, so a large variance means the data are spread out.