抽样指标

结论：本次调查被抽样品的微生物指标合格率较高，有害化学物质的污染并不严重，卫生状况较好，但功能性因子的合格率较低。

Conclusion : Qualified proportion of microbial index in this sampling inspection is higher , harmful chemical pollution is not serious , sanitary situation is better , but the qualified proportion of functional factor is a bit lower .

本文首先介绍了网络测量产生的背景当前发展现状做了总结，然后详细讲述了网络测量的一些基本概念，比如，数据包类型、抽样、网络测量指标体系、测量方法原则及分类等。

First , the development of network measurement background and current development are introduced . Then it describes some of the basic concepts of network measurement in detail , for example , packet type , sampling and classification systems are introduced .

另外，该方法通过对抽样信息价值及抽样成本等指标的考察，从经济角度保障了该方法的可行性。

Furthermore , applicability of the method is economically assured by investigation on factors such as values of randomly sampled information and cost of sampling .

用序贯抽样技术探讨了最适抽样数和采收指标。

The optimum sampling number and the harvesting index were revealed by sequential sampling technique .

最后以检验费用为目标函数，给出了最优化决定分组抽样数量的方法，提出了在数理统计角度上评价抽样方法的指标。

Moreover , taking the cost of inspection as the objective function , the optimal method for fixing the sample size in the stratified sampling has been obtained and the index for appraising the sampling method on the basis of the mathematical statistics has been proposed .