Sigma value, Z value, and the Cp value

01/04/2021
Understanding of normal distribution

Z conversion

Z= Capture                                                                             24
 

Process capability index


Cp= Capture22

 
Sigma value Z value Cp value DMPO
1 0.33 -
2 0.67 308.537
3 1.00 66.807
4 1.33 6.210
5 1.67 233
6 2.00 3.4

In the short term: 6σ
In the long term: 4.5σ

DMPO: Defects per million opportunities =Value of normal distribution-1.5(One side)

Methods for Productivity Improvement (Example)

25

27

 

Author: Phan Nguyen

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