...某日若属于发病时间的聚集即称为点流行，比较容易探讨病因， 如食物中毒二、 周期循环(cyclic change)与季节变动(season change)： 疾病的发生率或死亡率呈周期循环的现象， 如肠胃道疾病易发生于夏天、 支气管炎及脑膜炎则易发生于冬天。
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用统计学方法分析其变动与杂交方式及种植季节的关系。
The relationship between the quantitative change and crossing ways, and the cropping seasons was analyzed by statistics.
提出灰色GM(1.1)用电最预测模型的改进模型——灰色季节变动指数模型GSI(1,1)模型，将灰色预测方法与季节指数有机结合起来。
The paper proposes the improved model of GM (1, 1) model which is called GSI (1, 1). GSI (1, 1) model is the combi - nation of grey system and seasonal index.
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