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分析一年总量在时间上的分布特征是科学研究中常遇到的问题。水文学、气象学应用了向量合成表示法一集中度,这种新方法在河川月径流及月降雨量等方面的研究中显出了许多优点。本文以朝阳市多年来几种传染病的发病情况为例,对集中度在流行病学分析中的应用进行粗浅的探讨。材料与方法材料来源:朝阳市一九五九年至一九七八年疫情资料汇编和一九七九年至一九八二年传染病年报表。发病率均用年平均人口计算。方法:把周角分成12等份,每条射线代表一个月份发病率的向量方向。把各月的发病率乘上一个常数,做为绘图代表值,根据月方向把各月的发病率在
Analysis of the distribution of the total amount of one year in time is a problem often encountered in scientific research. Hydrology, meteorology, vector synthesis representation of a concentration, this new method in river runoff and monthly rainfall studies have shown many advantages. In this paper, the incidence of several infectious diseases in Chaoyang City for many years as an example, the concentration of epidemiological analysis of the application of shallow discussion. Materials and Methods Source of Materials: Compilation of Epidemic Statistics from 1959 to 1978 in Chaoyang City and the Annual Report on Infectious Diseases from 1979 to 1982. Incidence rates are calculated using the average annual population. Methods: Divide the circumference into 12 equal parts, each ray representing the vectorial direction of morbidity for a month. The incidence of each month by a constant, as a representative of the value of the plot, according to the month the incidence of each month at