【摘要】 对莒县1989年恙虫病病例分布类型进行势理概率慎式拟合分析,结果表明不符合泊松分布,而服从负二项分布,说明病例分布存在聚集性,并对聚集现象的因素进行了初步的分析。更多还原

【Abstract】 Analysis was made of the distributive probability of scrab typhus in Juxian in 1989.The result showed that the distribution was not a poisson one,but a negative binomial distribution.It suggested that there was clustering in case distribution.Preliminary analysis was also made of the factors in clustering.更多还原