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Suggestions - National Trend Interpretation Standard (s)?
Whether it suicide rates, crime, or GDP, the national media (and most everyone else) concludes significance by comparing two data points. To introduce the fact that there are generally accepted trend interpretation standards, should the quality community advocate for the application of one or more standard (s)? A trend chart would be a "gateway" to control charts (trend charts with control limits). If yes, is there one or more standards that you would recommend? If we had a link to the standards, we could reference the link when responding to misleading headlines. Thoughts?
Tim
5
One minute from Dr. Deming on management focus
From the PQ archives, here's a timeless treasure. View this one-minute clip from Dr. Deming to be reminded where to focus. Do you agree?
Beth S
5
Re: Suggestions - National Trend Interpretation Standard (s)?
Hi Matt, I posted the following on LinkedIn -- topic was suicides (25K+ views). Comments included an individual moving range chart and trend charts. https://www.linkedin.com/feed/update/urn:li:activity:6411984504356896768
I reference the following standard in my community -- "Median Trend Chart and Interpretation" https://wp.me/p7eYCh-5k This is a method advocate in healthcare.
I'm not a statistician -- it would be nice to have a recommendation for the media. I always liked the AIAG interpretation standard of 7 points -- ASQ/PQ used in support of Koalty Kid (K-12). E.G., 7 data points in a row above or below the average, 7 data points in a row trending up or down. This is the easiest to remember. Mike Cleary explained the significance of the 7 data points that made sense to me. My interpretation -- If you flip a coin and get 7 consecutive heads or tails, it's possible but not "usual." I think it's generally accepted that the XMR is a good all-purpose control chart. But, just introducing the fact that there are accepted and proven standards for interpreting a trend would be a significant improvement. Can we keep it simple?
I reference the following standard in my community -- "Median Trend Chart and Interpretation" https://wp.me/p7eYCh-5k This is a method advocate in healthcare.
I'm not a statistician -- it would be nice to have a recommendation for the media. I always liked the AIAG interpretation standard of 7 points -- ASQ/PQ used in support of Koalty Kid (K-12). E.G., 7 data points in a row above or below the average, 7 data points in a row trending up or down. This is the easiest to remember. Mike Cleary explained the significance of the 7 data points that made sense to me. My interpretation -- If you flip a coin and get 7 consecutive heads or tails, it's possible but not "usual." I think it's generally accepted that the XMR is a good all-purpose control chart. But, just introducing the fact that there are accepted and proven standards for interpreting a trend would be a significant improvement. Can we keep it simple?
Tim
5
Re: Audits - How best to prepare?
Maybe a little off topic - What I like to do is reading the main SOPs outloud (as funny as that sounds) in front of the key players to make sure it makes sense...From an Auditors perspective they want easily understand what your SOPs are saying and what they are asking for. This is critical.
Tony
5
Re: NIST numbers
In our system, we use this field to record the serial number of the master used for calibration.
The following information is taken directly form the NIST website and describes their intent of the use of the NIST number.
https://www.nist.gov/traceability/traceability-table-contents I.B.4 Is a NIST Test Report Number necessary and/or sufficient evidence of traceability? Test report numbers issued by NIST are intended to be used solely for administrative purposes. Although they are often used to uniquely identify documents which bear evidence of traceability, test report numbers themselves do not address the issues listed in I.B.1 above, and should not be used nor required as the sole proof of traceability. Jerry Longmire Senior Manager - Quality, Komatsu Mining Corp. Group
Re: Audits - How best to prepare?
That sounds like a wonderful technique Tony! I often use a similar approach when creating documentation and I like to broaden my audience to those who aren't familiar with the subject matter. If I can convince them it makes sense I feel better moving forward.
Thank you for sharing!
Thank you for sharing!
Eric G
5
NIST numbers
Do you record NIST numbers on your gages?
Some consider them vital for traceability while others only use for administrative tracking purposes.
What is your take on these numbers and do you use this field in GAGEpack?
Some consider them vital for traceability while others only use for administrative tracking purposes.
What is your take on these numbers and do you use this field in GAGEpack?
Eric G
5
Re: Spec Lines on a control chart?
Spec limits on a control chart is a change from standard practice. If the change is being required by those that do not understand histograms and control charts (among the 7 basic tools of quality), it indicates a different problem which may lead to tampering. I think society overall remains ignorant that success in any aspect of life is all about reducing variation from the ideal. A broader description of variation: http://asq.org/learn-about-quality/variation/overview/overview.html
Tim
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