Methods 4 types of curve-model such as Inverse function model, Power function model, Logarithmic function model and S-function model were used to fit the trend of Type-B encephalitis incidence rate.
方法采用倒数函数、幂函数、对数函数、S型函数四个曲线函数拟合乙脑发病率，经比较选择倒数函数为较优拟合模型。
Methods 4 types of curve-model such as Inverse function model, Power function model, Logarithmic function model and S-function model were used to fit the trend of Type-B encephalitis incidence rate.
方法采用倒数函数、幂函数、对数函数、S型函数四个曲线函数拟合乙脑发病率，经比较选择倒数函数为较优拟合模型。
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