covariance

Noun
  1. (statistics) the mean value of the product of the deviations of two variates from their respective means (synset 106034695)
    referred to in: statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
    is a type of: variance - the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value

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