Methods By multivariate analysis of variance on 4 service quantity indexes of the service institutions in 11 cities of 3 areas, of 2 types were comprehensively analyzed.
方法对我国3个区域、11个城市、2个类型的服务部门，综合考虑4项服务量指标，进行多元方差分析。
2
The method avoids large amount of variance calculation and its calculation quantity is only about 50% that of Otsu method. It can fulfill the demands of adaptability and real time.
该方法避免了大量的方差计算，计算量仅为大津法的50%左右，能够满足自适应性和实时性的要求。
3
Detecting rate of the secondary gauge along with the variance of water quantity is analyzed, therefore, leakage can be identified. This method can reduce water consumption.