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SPC Charting frequency calculator for X hi/lo chart

Posted 16th May 2018 at 11:51 AM by bobdoering (Bob Doering)
Updated 6th July 2018 at 09:19 AM by bobdoering

One of the things that is unclear with Shewart charts is the frequency of charting. However, with the X hi/lo chart for precision machining, the frequency can actually be calculated. Attached is the Excel calculator for determining frequency. The...
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File Type: xlsx x hi-lo charting freq calc.xlsx (9.1 KB, 916 views)
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Unilateral Tolerance Capability Calculation

Posted 17th May 2016 at 09:07 AM by bobdoering (Bob Doering)
Updated 2nd December 2017 at 08:59 PM by bobdoering

Capability indices and calculations are tough enough as it is, but a common approach of using Cpu or Cpl ("half Cpk's") is statistically incorrect. It assumes the data is normal - which is unlikely as you approach the physical limit (0 for...
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File Type: pdf unilateral tolerance capability calculation rev 6 120217.pdf (325.8 KB, 230 views)
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Goodness of Fit: Is it normal? Probably...or probably not - it's all probability

Posted 1st March 2010 at 05:03 PM by bobdoering (Bob Doering)
Updated 26th May 2014 at 11:09 AM by bobdoering

When looking at goodness of fit statistics, what you are determining is the probability of whether the data does not fit the specific distribution. In Charles Annis page on Anderson-Darling, his Note 1 does a good job of explaining what you are really...
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"It's just extra paperwork"

Posted 25th February 2009 at 09:19 PM by bobdoering (Bob Doering)

Did you ever run into some folks that did not feel like filling out their quality documents? Give them this example:

Imagine going down the canned food aisle of the grocery store. Suppose none of the cans had a label. Is that a problem?...
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