作者: Pae-Tsi Yuan
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摘要: I NTRODUCTION* * 'T'he metho(d of treatinig frequency curves as developed chiefly l)y Fdgeworth, Kapteyn. Vanl U veni and( NVicksell occupies an iml)ortant place in both tlheoretical anid applied statistics. The essenice this metlhod maxv he briefly sunmimarized follows: Suppose a fulnctioni the variable z is distributed according to normal law error. 'rlTen. certainily canniiot be also normallv (listributed, ivunkss funiction liniear functioni . Withlout losinig genierality. we shall write niormiially stanidard units = f6z). Thus origin its mean ani(l unit x stand(lar( (leviation. Trhe relative values betw-een andt + dx is, therefore