ar X iv : a st ro - p h / 98 10 19 4 v 1 1 3 O ct 1 99 8 Biased - estimations of the Variance and Skewness


Nonlinear combinations of direct observables are often used to estimate quantities of theoretical interest. Without sufficient caution, this could lead to biased estimations. An example of great interest is the skewness S 3 of the galaxy distribution, defined as the ratio of the third moment ξ 3 and the variance squared ξ 2 2 smoothed at some scale R… (More)


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