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Considering the constraints of the single correlation coefficient, proposes the idea of correlation coefficient series to determine the trend of correlation evolvement over time. And conducts a empirical study with the correlation between PMI and GDP.
In recent decades, process capability indexes have become a popular means of describing the ability of a process to produce products that meet certain specifications, and there have been some disputes on the classical process capability indexes have been some. This paper set forth some new thoughts on the equation of process capability index from many aspects, especially clarifies the wrong view that...
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