油松毛虫幼虫序贯抽样技术的研究

A Study on Sequential Sampling Techniques of Chinese Pine Caterpillar Larvae

本文在测定油松毛虫经济阈值的基础上,对4种序贯抽样技术进行了研究,得出如下4点:(1)以概率分布为基础的序贯抽样模型为:d_0=27.35043N-570.3982,d_1=27.35043N+570.3982;(2)Iwao(1975)的序贯抽样模型为:(3)Kuno(1968)的序贯抽样模型为:(4)高春先(1983)的复序贯抽样:以Iwao方法为基础,同时结合Kuno方法作出判断.当经济阈值m_0=30,D_0=0.20时,以概率分布为基础的序贯抽样的最大抽样数为复序贯抽样的10倍,Iwao的序贯抽样为复序贯抽样的3.75倍.由此说明复序贯抽样可以进一步减少样本单元数,提高判别能力.

In this paper, four kinds of sequential sampling techniques have been studied under the condition of testing the economic threshold (or critical density) of Dendrolimus tabulae formis Larvae. The cosequential sampling is based on Iwao's method in association with Kuno's method. When the critical density was 30, D0 = 0.20, the maximum number of samples in the original sequential samle was about 10 times as many as that in the cosequential sample, and about 3.75 times asmany as that in the Iwao sample. Thus, in the cosequential sample, the sample size may be further reduced and the efficiency could be raised.