The Journal of the Operational Research Society, Vol. 60, No. 12 (Dec., 2009), pp. 1775-1785 (11 pages) The research on efficiency valuations has used two distinct approaches. One is the nonparametric ...
Data refers to numbers, characters, text, and images that you arrange in some sort of logical or meaningful way. This is categorical data without any inherent order. Examples include blood group, ...
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