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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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 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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 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
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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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