High Quality Content by WIKIPEDIA articles! In statistics, a sequence or a vector of random variables is homoscedastic if all random variables in the sequence or vector have the same finite variance. This is also known as homogeneity of variance. The complementary notion is called heteroscedasticity. The alternative spelling homoskedasticity or heteroskedasticity is also used frequently. The assumption of homoscedasticity simplifies mathematical and computational treatment. Serious violations in homoscedasticity result in overestimating the goodness of fit as measured by the Pearson coefficient

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