Definition of "sphericality" [sphericality]

• Sphericity. (noun)

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• "Statistical inference The regression model Estimating the model Assumptions on the independence of and X Hypothesis testing Assumptions on the distribution of When the assumptions break down Background reading Assumptions on the distribution of The OLS model assumes that the i are i.i.d., so E () = σ2 In×n (24) The OLS estimator is unbiased even if this "sphericality" assumption is violated, e.g., the errors are not independent or σ2 σ2 for some i, j. i j However, the OLS estimator may not have the lowest variance, among linear unbiased estimators; in the lingo, it is not the best linear unbiased estimator (BLUE)."
• "If one wishes to argue evolutionary theory is as sure as the sphericality of the Earth, that level of dissent by such a highly educated group absolutely flies in the face of such inflated claims."
• "When properties are represented in experience, they are often attributed to ordinary objects: for instance, one may have a visual experience that attributes redness and sphericality to a tomato, or a haptic tactile experience that represents smoothness and cylindricality of a cup in one's hands, or an olfactory experience attributing scents to flowers, or a gustatory experience attributing deliciousness to something one is chewing."