In statistics, a collection of random variables is heteroscedastic if there are sub-populations that have different variabilities from others. Here `variability` could be quantified by the variance or any other measure of statistical dispersion. Thus heteroscedasticity is the absence of homoscedasticity. The possible existence of heteroscedastic.....
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http://en.wikipedia.org/wiki/Heteroscedasticity
Non-constancy of the variance of a measure over the levels of the factor under study. ... Origin: hetero + G. Skedastikos, pertaining to scattering, fr. Skedannumi, to scatter ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: het′ĕr-ō-skĕd′as-tis′ĭ-tē Definitions: 1. Nonconstancy of the variance of a measure over the levels of the factor under study.
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http://www.medilexicon.com/medicaldictionary.php?t=40823
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