中文摘要：

进一步研究如何利用H值来筛选证券组.推导了关于H值组成部分相关量的具体表达式,并得到了证券组中去掉最“差”的一种证券后H值改变量满足的一个不等式.

英文摘要：

Further study was given in this paper to the H value as a standard for evaluation of the quality of a security set. The H value in terms of its related parameters was characterize, d. An inequality which the changed H value satisfies after removing the ＂worst＂ security from the set was proved.