The concept of assessment reference period is put forward. The relation among exceeding probability, recurrence period and annual meanincidence of intensity is deduced.
提出评估基准期的概念，推导出烈度的超越概率与重现期、年平均发生率三者间的关系。
2
The mean evaporation and mean air pressure were correlation to the incidence of typhoid fever and paratyphoid fever.
自变量对输出的贡献量分析结果显示，平均蒸发量和平均气压对于伤寒副伤寒发病率影响最大。
3
Objective:Investigated the incidence of college students' hematochezia, comprehended the related factors, mean while provided health education, to reduce the symptoms.