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.

q control chart tracks the fraction conforming

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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