Quality Score - q Chart in Excel
Use a q chart is to evaluate process stability when counting the fraction conforming.
Here is a sample q chart creating using QI Macros.
The q chart is used when counting the number of conforming items in a sample versus counting the number of defects in a sample as in the p chart. q= (1-p). Therefore the UCL and sigma lines can never be greater than 100% as in the above example.
To run a q chart in QI Macros, just select your data and run the p chart.
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