product variance

English

product variance (plural product variances)

(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 ${\\displaystyle x,\\ y,\\ z}$ , correlated and normally distributed, with means ${\\displaystyle 0,\\ 0,\\ 0}$ , variances ${\\displaystyle \\sigma _{1}^{2},\\ \\sigma _{2}^{2},\\ \\sigma _{3}^{2}}$ and product variances ${\\displaystyle r_{12}\\sigma _{1}\\sigma _{2},\\ r_{13}\\sigma _{1}\\sigma _{3},\\ r_{23}\\sigma _{2}\\sigma _{3}}$ , a sub-population is extracted […] .

单词	product variance
释义	product variance English Noun product variance (plural product variances) (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 ${\\displaystyle x,\\ y,\\ z}$ , correlated and normally distributed, with means ${\\displaystyle 0,\\ 0,\\ 0}$ , variances ${\\displaystyle \\sigma _{1}^{2},\\ \\sigma _{2}^{2},\\ \\sigma _{3}^{2}}$ and product variances ${\\displaystyle r_{12}\\sigma _{1}\\sigma _{2},\\ r_{13}\\sigma _{1}\\sigma _{3},\\ r_{23}\\sigma _{2}\\sigma _{3}}$ , a sub-population is extracted […] .
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