本文简述工序能力指数的传统定义及其不合理性，其根源是偏移系数的定义有缺陷。
The essay narrates briefly the traditional definition and the unreasonableness of process capability index, and the source is that the definition of shift coefficient has defect.
在纹理上一个应用到所有值的偏移系数。有效的范围是0到·。范围是0到1。缺省值是0。
An offset factor applied to all values in the texture. The valid range is 0 to ·. The range is 0 to 1. The default value is 0.
注意，按照DB 2 Spatial Extender范例，在乘上比例系数之前，浮点值要减去偏移量。
Note that, following the paradigm of the DB2 Spatial Extender, the offset is subtracted from the floating point value before the scale factor is multiplied in.
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