经济颖测方 ab In y,=hn a+tIn b Y=A+tB tIn y B In b b=In B ∑Y∑h In a ∴a=hA经济预测与决策方法 t t y = ab ln yt = ln a +t ln b Yt = A+tB b t t y t tY B t t ln ln 2 2 =  = =     b B 1 ln −  = a A 1 ln −  = a n y n Y A t t ln ln =  =  =