... 不良数管制图 number of defectives control chart 记量值管制图 variables charts 缺点数管制图 number of defects control chart ...
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Control Charts for Variables 计量值管制图 ; 计量值控制图
Control Charts for Variables Data 变量数据的控制图
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From the looks of it ECRI takes the first principle component of these four variables and then charts the first time derivative.
FORBES: On Lakshum Achuthan and ECRI: This is Becoming Embarrassing for Everyone
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