product variance

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product variance (plural product variances)

  1. (obsolete or rare) Covariance.
    • 1934, A. C. Aitken, "Note on Selection from a Multivariate Normal Population", Proceedings of the Edinburgh Mathematical Society 4, page 106:
      From a population characterised by variables , correlated and normally distributed, with means , variances and product variances , a sub-population is extracted [] .