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本文试用圆形分布的理论和方法,对1984~1986年广西乙脑平均发病高峰期作一初步分析。材料与方法 1.乙脑发病数:系来自广西各地、市,县各月的上报疫情数。2.方法:先用计算平均秩的方法,求出各月天数的组中值转,再换成角度(α),其正弦、余弦值与各月病例数(f)相乘,然后算出平均角度((?))和角度标准差(s),用(?)±
This paper tries to use circular distribution theory and method to make a preliminary analysis of the average peak incidence of Japanese encephalitis from 1984 to 1986 in Guangxi. Materials and methods 1. The incidence of Japanese encephalitis: Department from Guangxi throughout the city, county reported the number of epidemic each month. 2. Methods: Calculate the mean rank of the method, first of all the number of days in the group to find the median turn, and then replaced by angle (α), the sine and cosine values and the number of cases (f) multiplied, and then calculate the average Angle ((?)) And angle standard deviation (s), using (?) ±