The problem with adding the individual errors is the canceling effect of the positive and negative values . 把各个误差直接相加的结果是,正值和负值相互抵消了。
2.
Most data of three economic zones are assessed and examined . the data of three economic zones are not equal to the sums of districts ( counties ) 三大经济区的多数统计数据经过评估和测算而取得,其合计数不等于各区县数据直接相加数。