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对于非线性函数线性组合型相关方程，本文提出了交替运用非线性拟合和逐步线性回归分析相结合的方法一逐步非线性拟合。这一方法应用于石油馏分临界温度、临界压力对密度和平均沸点的经验关联取得满意的结果。
For the linear combination equation of nonlinear function, this paper presents a stepwise non-linear fitting method using a combination of nonlinear fitting and stepwise linear regression analysis alternately. This method is applied to the critical temperature of petroleum distillates, and the critical correlation between the critical pressure and the density and the average boiling point is satisfactory.