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在计算机上进行统计计算，采用以多项式表示的具有一定精度的近似公式，要比使用统计表格方便。对统计检验中常用的几种分布（正态、２、ｔ和Ｆ分布）临界值的计算，经过比较与分析，推荐用与其相应的近似公式，并分析了这些公式的近似性和误差范围。当自由度较小时，由于结果的误差较大，故列出了解析解。对少数近似性较差的情况，提出了一些改进办法。分析表明，用近似公式来替代统计表格，可基本满足计算的要求
Statistical calculation on the computer, using polynomial representation of approximate formula with a certain accuracy, than the use of statistical tables to facilitate. For the calculation of the critical values of several distributions (normal, 2, t and F distributions) commonly used in statistical tests, it is recommended to use the corresponding approximation formulas after comparison and analysis, and the approximation and error range of these formulas are analyzed . When the degree of freedom is small, the analytical solution is listed because of the large error of the result. For a few cases with poor approximations, some improvements have been proposed. The analysis shows that the replacement of statistical tables by approximate formulas can basically meet the calculation requirements