一定要注意，确定性因子实际上是一个统计学概率的估计值，表示正确识别目录的概率。
It is important to note that the certainty factor is actually an estimate of the statistical likelihood that the category was identified correctly.
用表基数（560,273 条记录）与谓词过滤因子 (0.0014%) 相乘就获得了 QUALIFIED_ROWS 的估计值。
The estimate for QUALIFIED_ROWS is obtained by multiplying the table cardinality (560,273 records) by the predicate filter factor (0.0014%).
提出了一种自适应变步长恒模盲均衡算法，利用剩余误差信号的自相关函数估计值作为控制步长的因子来自适应改变步长的大小，克服了恒模算法存在的固有缺陷。
A new variable step-size CMA blind equalization algorithm is introduced to conquer the defects of CMA, in which the step size is controlled by the estimation of error signal's autocorrelation.
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