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   Joanne New Member

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   I have improved defective rate from 8521ppm to 2203ppm.
   What is the improvement percentage for above?
   How should I calculate?

    

   Joanne, Dec 23, 2015

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   Candi1024 Well-Known Member

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   Improvement/previous I would assume.
   
   (8521-2203)/8521 = 74%

    

   Candi1024, Dec 23, 2015

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   Bev D Moderator Staff Member

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   the improvement is the change - or decrease - in ppm from the start to the new level. the percentage improvement is then the change divided by the start: (8521-2203)/8521 = .74 = 74% improvement
   
   of course I can't help but ask if these estimates are based on averages of control charted data to ensure the improvement is solid.

    

   Bev D, Dec 23, 2015

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