The averaging procedure is therefore unsuitable for correction and systematic error on each line has to be separately computed.

给系统误差适当约束，即可求解出各测线的系统误差。 分别校正系统误差和随机误差，便完成闭合差校正。

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For example, even though pvh first thought it could sell Calvin Klein men's sportswear at 700 to 800 U.S. department store locations with in-store space of 1, 500 square feet, it cautiously launched in just 150 stores, with only 500 square feet each. (Today the line is in 500 stores, averaging 750 square feet.) "As the business rolled out, we ramped up to the appropriate size, " says Emanuel Chirico, who was named chief executive last February.

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