<正>序贯抽样决策的核心问题是抽样数量的多少及其样本单元所反映的动态信息特征。笔者提出了“基本抽样数 (nmin)”概念 ,并分别就不同的序贯抽样决策模型给出了相应的计算公式。在林间抽样决策中 ,预定的抽样数 (n)应大于或等于nmin(即n≥nmin) ,以避免序贯抽样曲线方程对判断结果影响。结合最大抽样数nmax,两者确定了序贯抽样曲线方程的适用范围。

It’s a key question to decide the number of sampling unit in the sequential sampling associated with the dynamic information characterismic of units.In the paper,the conception of"The number( n min )of basic sampling unit"was first put forward,and its count equation was given.When using sequential sampling,The number of units( n )in sampling design must be bigger than or equal to n min ( n≥n min ).Both n min and n max decide the useful range of the sequential sampling linear eqution.