权重是针对某一指标而言。某一指标的权重是指该指标在整体评价中的相对重要程度。 在等精度测量中，具有同一方差的单次测得值的权数为1，将等于1的权特称为单位权。
产生的原因在于单位权方差与分布的总体方差不相等。
The cause is that the unit weight estimation variance and the generality variance of the distribution don't equal with each other.
三角洲量单位权方差的先验估值一般用经典菲列罗公式计算。
A prior estimate of unit weight variance is usually calculated by the classicalFerrelo's formula.
本文运用数理统计学原理分析了南通市一级导线网（B区）单位权中误差偏大的原因；
This paper analysis the reason why the middle error of unit weight in first class traverse of Nan Tong City (B area) is bigger with the principle of mathematic statistics;
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