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我县伤寒间隔10年(1961、1971、1981)1次大流行,每年8月为发病高峰。但自1981年明确M_1株流行后,发病高峰时间发生了变化。对此我们试用园形分布统计分析方法进行了探讨。分组将1981年以来伤寒发病资料分为3组。1组:1981～1983年,作为无M_1株伤寒流行年资料;2组:1984～1986年,作为流行年后、M_1株流行前期资料;3组:1987～1989年,作为M_1株伤寒流行年资料。统计计算平均角,以表示发病的集中时间。计算角标准差(δ),(?)±S 估计发病高峰期。结果发病高峰日期1组=215.32°,
My county typhoid fever interval 10 years (1961, 1971, 1981) a pandemic, the peak incidence in August each year. However, since the clear M_1 epidemic in 1981, the peak incidence has changed. In this paper, we try the garden distribution statistical analysis method is discussed. Divide the typhoid fever incidence data into three groups since 1981. Group 1: From 1981 to 1983, it was used as M0-free typhoid epidemic year data; Group 2: 1984-1986 as pre-epidemic M_1 strain pre-epidemic data; 3 groups: 1987-1989 as M_1 epidemic year data. Calculate the average angle of statistics, to indicate the incidence of focus time. Calculate the standard deviation (δ), (±) ± S to estimate the peak incidence. Results The peak incidence date 1 group = 215.32 °,