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Jun 28, 2010 8:04 PM
(631 views)

In the chapter of "Multivariate Control Charts" > "Ungrouped Data" > "Phase 1 - Obtaining Targets" I couldn't get the UCL value of 11.03 by following the formula shown in "Statistical Details".

Is there anyone out there kind enough to clarify?

Cheers,

CGC.

4 REPLIES

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Jul 2, 2010 7:46 AM
(561 views)

Click Alphabetical List of Files

Navigate to Steam Turbines Historical and click link to file

Go to Graph>Control Chart> Multivariate Control Chart

Add Fuel, Steam Flow, Steam Temp, MW, Cool Temp, & Pressure to the Y Columns

Click OK

I get a UCL of 11.03

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Jul 7, 2010 12:57 AM
(561 views)

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Jul 2, 2010 9:56 AM
(561 views)

(((n-1)^2) / n) * beta quantile(1-alpha, p/2, (n-p-1)/2)

There seem to be a couple of issues with the documentation.

1. n is incorrectly defined for ungrouped data. It should be the number of data points, not the group sample size

2. The definition of alpha in the docs is not made clear but appears to be what I have written as 1-alpha with alpha the one sided level of risk

Michael

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Jul 7, 2010 12:41 AM
(561 views)

There are errors in the documentation for Phase 2 as well, fyi.