Abstract: In this paper, an iterative algorithm for evaluating criticalvalue of F-test based on two order expanding is obtained by means of the relation between Beta and F distibution functions. It is proved by an example that our method is quick and effective in practice.

Key words: F-test method, criticalvalue, two order expanding, iterative algorithm.

摘要： 本文利用Beta分布与F分布之间的关系，获得了一种基于二阶展开求解F检验临界值的迭代算法，并给出具体算例证实了这是一种较为快速而行之有效的方法。

关键词: F检验法, 临界值, 二阶展开, 迭代算法。