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TonyCoolearth
USA
14 Posts |
 Posted - 14 Jan 2014 : 12:40:30
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Hey there
I've got an XBarSigmaChart that I would like to modify such that instead of automatically computing XBAR, I can supply it. Our customer would like to see all values relative to their specified target value, rather than seeing them relative to the computed mean.
Anyone have an idea the shortest path to that objective?
Thanks
Tony |
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quinncurtis
1586 Posts |
Posted - 14 Jan 2014 : 13:53:07
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It's more complicated than just setting a mean value. As far as the chart, the control limit values are based on the mean and sigma values, and the sigma calculation requires the use of the process mean. So basically, you must set both the mean and sigma at the same time to the target values you are trying to achieve. In addition to the mean value, do you also have the sigma (or +- 3-sigma values) you want to use as the control limits?
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TonyCoolearth
USA
14 Posts |
Posted - 14 Jan 2014 : 14:23:29
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| Indeed I do! |
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quinncurtis
1586 Posts |
Posted - 14 Jan 2014 : 14:43:11
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Then you should be able to use the charts SetControlLimitValues, where the values are specified in the order: (Primary Chart Target, Primary Chart -3 sigma limit, Primary Chart +3 sigma limit, Secondary Chart Target, Secondary Chart -3 sigma limit, Secondary Chart +3 sigma limit).
double [] controllimitvalues = {42, 30, 53, 10, 0, 22};
this.ChartData.SetControlLimitValues(controllimitvalues);
This, and related methods, are described in Chapter 6 of the manual, under the subhead SPC Control Limits. See the example program TimeVariableControlChart.MedianRangeChart. |
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TonyCoolearth
USA
14 Posts |
Posted - 14 Jan 2014 : 17:03:24
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| Thanks! That did it! Have a great day! :) |
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setting x-bar instead of computing it
