World English Dictionary
heteroscedastic (ˌhɛtərəʊskɪˈdæstɪk)
1.  (of several distributions) having different variances
2.  (of a bivariate or multivariate distribution) not having any variable whose variance is the same for all values of the other or others
3.  (of a random variable) having different variances for different values of the others in a multivariate distribution
[C20: from hetero- + scedastic, from Greek skedasis a scattering, dispersal]

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