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３、４误差项的独立性按产生原因分项，其误差项的相关性，可简要概括如下：：ａ））两独立误差原因所引起的两误差项相互独立。ｂ）同一误差原因所引起误差项线性相关。如果一个误差原因（△Ｑｋ同时引起一系列误差项（△Ｙｋｊ（ｊ＝１～ｎｋ）），，建议用系数代数相加...
3, 4, the independence of error items is divided according to the causes of production. The correlation of error items can be briefly summarized as follows: a)) The two error items caused by two independent errors are independent of each other. b) The error caused by the same error causes a linear correlation. If an error cause (△ Qk at the same time cause a series of error terms (△ Ykj (j = 1 ~ nk)), it is recommended to use coefficient algebraic addition ...