1985年,随州市在丝虫病的调查中应用两阶段容量比例概率的抽样方法(PPS),以探讨微丝蚴血症者的空间分布。抽样方法:以前未作正规调查,估计微阳率 P 为0.5(50%),允许误差(S)为基本消灭指标的1/2,即0.5%(0.005)。为提高鉴别的水准,将α值定为α=0.01,代入公式 N=(υ_α/s)~2p(1-p),求得调查的总人数(n)为66564。地图资料提供,一个村的毗 In 1985, Suizhou City applied a two-stage probabilistic probabilistic sampling method (PPS) in the investigation of filariasis to investigate the spatial distribution of microfilariaemia. Sampling method: In the past, no formal survey was conducted, and the estimated micro-positive rate P was 0.5 (50%), and the allowable error (S) was 1/2 of the basic elimination index, ie, 0.5% (0.005). In order to improve the level of discrimination, the alpha value is defined as α = 0.01, substituting the formula N = (υ_α/s) ~ 2p (1-p), and the total number of investigations (n) is 66564. Map information provided by a village