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本文采用Ward提出来的离差平方和系统聚类法,在IBM-Pc/XT微机上完成对15个县(农场)的72个距大堤不同距离的湖洲血吸虫病易感地段的分析。聚类时选用阳性钉螺密度。阳性野粪密度和本地人群在某地段接触疫水频度占整个接触频度的百分比等三个主要指标。聚类分析所用的三个指标可结合成一个计算易感地带,验指数的公式,用以反映垸外不同距离
In this paper, Ward’s deviation squared sum system clustering method was used to analyze 72 susceptible sections of lakes and schistosomiasis at different distances from the embankment in 15 counties (farms) on IBM-Pc / XT microcomputer. Aggregate selection of positive snail density. Positive wild feces density and local populations in a lot of contact with the frequency of the frequency of the entire exposure frequency of the three major indicators. The three indices used in cluster analysis can be combined into a formula for calculating susceptibility zones and exponential indices to reflect different distances outside the embankment