Regressioonsirge on korratavustingimustel sooritatud mõõtmise tulemusena saadud mõõteseeria aritmeetiliste keskmiste ja mingi muutuva suuruse (mõjuri, tunnuse vms) lineaarne funktsioon.
A regression line is a linear function of the arithmetic mean of a series of measurements obtained as a result of measurements performed under repeatability conditions and some variable (factor, characteristic, etc.).
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