The principle of variance analysis was introduced briefly. The block diagram and program of computation were given.

本文简要地介绍了方差分析的原理，给出了计算机程序框图和详细的程序。

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Focusing on an error appeared in big number error computation on computor, this paper gives the necessity and method for data per-processing based on the Theorem of Variance.

本文针对计算器在大数误差计算中出现的一个错误，根据方差定理，提出数据予处理的必要与方法。

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The method of minimum interclass variance needs to compute conic statistic in segmenting image, which costs a large computation but has less efficiency.

最小类内方差法分割图像时需要计算二次统计量，运算量大，效率不高。

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