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XBAR and R Charts - 平均值-极差控制图 http://www.sytsma.com/tqmtools/xbar-r.html Theoretical Control Limits for XBAR Charts Although theoretically possible, since we do not know either the p... 阅读全文
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u Charts- 单位缺陷数控制图 http://www.sytsma.com/tqmtools/uchart.html Attribute control charts arise when items are compared with some standard and then are classified as to whether they meet the s... 阅读全文
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Normality test A normality test is a statistical process used to determine if a sample or any group of data fits a standard normal distribution. A normality test can be performed mathematically or g... 阅读全文
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Constructing Run Charts A run chart is a line graph that shows data points plotted in the order in which they occur. They are used to show trends and shifts in a process over time, variation over time... 阅读全文
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http://www.isixsigma.com/offsite.asp?A=Fr&Url=http://www.skymark.com/resources/tools/control_charts.htm Control Charts Every process varies. If you write your name ten times, your signatures will a... 阅读全文