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针对协方差分析中离均差乘积和的计算方法较为复杂这一难点,根据大多数人掌握在具有统计功能的计算器或计算机中计算相关系数比较便利的特点,应用协方差分析中离均差乘积和的计算公式与积差相关系数的计算公式的相同部分,利用代入法和换算法推导出新的离均差乘积和的计算公式。对新建立的公式进行了推导和验证运算,均准确无误。并用相同的实例证明原公式与新公式的计算结果完全相同,且新公式简捷,有效及实用。
According to the difficulty that the calculation method of the sum of mean-squares products in the covariance analysis is complex, according to the fact that most people have the advantage of calculating the correlation coefficient in the calculator or computer with statistical functions, The product of the sum of products and the product of the formula for calculating the correlation coefficient of the difference between the same part of the use of substitution and conversion method derived from the product of the product of the mean deviation from the sum of the formula. The newly established formula was derived and validated computing, are accurate. The same example is used to prove that the original formula and the new formula have exactly the same result, and the new formula is simple, effective and practical.