What does product variance mean?

product variance

Word Rarity Rare

Frequency: Zipf frequency 3.44 in modern English

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noun

Obsolete

"From a population characterised by variables x,#92;y,#92;z, correlated and normally distributed, with means 0,#92;0,#92;0, variances #92;sigma#95;1²,#92;#92;sigma#95;2²,#92;#92;sigma#95;3² and product variances r#95;#123;12#125;#92;sigma#95;1#92;sigma#95;2,#92;r#95;#123;13#125;#92;sigma#95;1#92;sigma#95;3,#92;r#95;#123;23#125;#92;sigma#95;2#92;sigma#95;3, a sub-population is extracted[…]."

product variances (plural)

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