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。
Objective to Monitor and forecast the incidence rate of Type-B encephalitis effectively and provide basic information for preventing Type-B encephalitis and treating cases of Type-B encephalitis.
目的对乙脑进行有效监控预测，为乙脑疾病的预防与治疗提供依据。
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