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Dr. Wayne A. Taylor   linkedin
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Ann Taylor
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Acceptance Sampling

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Trending and Change-Point Analysis

Change-Point Analysis is a powerful trending tool for detecting change, including multiple changes.  It is a great CAPA investigation tool and should be performed anytime a traditional control chart detects a change to better understand the change.  A change-point analysis outperforms traditional control charts at detecting a sustained shifts in the average.   Even if it looks like there may have been a change but the control chart has not yet signaled anything, try a change-point analysis.  The software package Change-Point Analyzer performs a change-point analysis.

Normalized IN charts solve the issue of not being an able to normalize Individuals (I) charts.  While similar to the Laney U' and P' charts, they can be used in other situations not involving count data.  and IN charts may be the only 2 types of charts you ever need.

The exception to the statement the  and IN charts may be the only 2 types of charts you ever need, is for nonnormal data.  On common case of this is count data were the counts average 10 or less, such as complaint data.  The U and P charts are commonly used in this case.  However, for counts both have increased rates of false signals, possibly as high at 1 in 11.  Adjusted control limits are provided below fixing this issue.

 

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Last modified: September 08, 2017