segregation variance of increment collection
- Ss2, nthe variance caused by nonrandom distribution of ash content or other constituent in the lot. For a method of estimating this variance, see Annex A1 of Test Methods D2234/D2234M. D2234/D2234M
ASTM D121-09a Standard Terminology of Coal and Coke. 2014.
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variance — n the mean square of deviations (or errors) of a set of observations; the sum of squared deviations (or errors) of individual observations with respect to their arithmetic mean divided by the number of observations less one (degrees of freedom);… … Coke&Coal Terminology