цитата... :)
Nov. 14th, 2007 05:33 pmThe village dummy should not be confused with the village idiot. The distinction is subtle, but should not be overlooked.
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Fixed-effect estimation of technical efficiency with time-invariant dummies
Qu Fenga and William C. Horraceb
из
Fixed-effect estimation of technical efficiency with time-invariant dummies
Qu Fenga and William C. Horraceb