the Difference Between Short Term Variation and Long Term Variation

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Posted by: Joe Perito
Posted on: Friday, 27th April 2001, 12:00 AM.

Generally short term vaiation is tested by taking consecutive samples in a short period of time. During this period operators are usually instructed to make no changes in the process. You therefore calculate the process variation (standard deviation) based on the best the process can do with out any changes. The long term variation usually collects data over time including process afjustments, including many operators running the process, new batches of raw materials, day shift/night shift, different suppliers, different gages, hot/cold, fast/slow, tool changes... all the variation you might normally expect to be included in the process. As for PpK/CpK, they mean one or the other and you will find people confusing the definitions and you "WILL" find books defining them versa and vice versa. You will have to ask the definition the person is using that you are talking to.

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 Message Thread:

The Difference Between Short Term Variation and Long Term Variation by Lady Six Sigma on Thursday, 26th April 2001

Re: the Difference Between Short Term Variation and Long Term Variation by Rao on Thursday, 26th April 2001

Re: the Difference Between Short Term Variation and Long Term Variation by Marc Richardson on Thursday, 26th April 2001

Re: the Difference Between Short Term Variation and Long Term Variation by Joe Perito on Friday, 27th April 2001

Re: the Difference Between Short Term Variation An by Charlie Pfaff on Tuesday, 21st May 2002

Re: the Difference Between Short Term Variation An by Gabriel on Tuesday, 21st May 2002

Re: the Difference Between Short Term Variation and Long Term Variation by Ken Myers on Tuesday, 1st May 2001

Re: the Difference Between Short Term Variation and Lo by semimike on Wednesday, 8th June 2005

Re: the Difference Between Short Term Variation and Lo by Stan on Wednesday, 8th June 2005

Re: the Difference Between Short Term Variation and Lo by semi-mike on Thursday, 9th June 2005

Re: the Difference Between Short Term Variation and Lo by Andy U on Thursday, 9th June 2005

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