InDina [[probability theory]] andjeung [[statisticsstatistik]], '''skewness''' isnyaeta aukuran measure of the asymmetry ofkateu-simetrian the [[probability distribution]] of atina nilai-[[real number|real]]-valued [[random variable]]. RoughlySacara speaking,kasar abisa distributiondisebutkeun, hassebaran positivemibanda ''skew'' ifpositip the if the positivelamun ''tail'' ispositip longerpanjang and negativesarta skew ifnegatip the negativelamun ''tail'' isnegatip longerpanjang.
Skewness, the third [[standardized moment]] nu katilu, isdiartikeun defined asku μ<sub>3</sub> / σ<sup>3</sup>, wherenumana μ<sub>3</sub> is the thirdngarupakeun [[moment about the mean]] andkatilu sarta σ is thengarupakeun [[standardsimpangan deviationbaku]]. The skewness of atina random variable ''X'' iskadangkala sometimes denotedngalambangkeun ''Skew''[''X''].
For a sample of ''N'' values the sample skewness is Σ<sub>''i''</sub>(''x''<sub>''i''</sub> − μ)<sup>3</sup> / ''N''σ<sup>3</sup>, where ''x''<sub>''i''</sub> is the ''i''<sup>th</sup> value and μ is the [[mean]].
