About CP & CPK
As new people for 6Sigma I am not very clear for the calculate method of Cp &CPK. All of you who can explain the formula as follow :
Calculating Cp:
Cp = Spec width / Process width
Where Process width = (6 * s)
Use s from the loss-function lab
Calculating Cpk:
Cpk = (1 – k) * Cp
Where k = ( – target)/ ½ * specification width
I want to know :
1.what's the difference of SPEC width and Process width ;
2.How we can get the loss-function lab；
Thanks !
Calculating Cp:
Cp = Spec width / Process width
Where Process width = (6 * s)
Use s from the loss-function lab
Calculating Cpk:
Cpk = (1 – k) * Cp
Where k = ( – target)/ ½ * specification width
I want to know :
1.what's the difference of SPEC width and Process width ;
2.How we can get the loss-function lab；
Thanks !
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过客1973 (威望:0)
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For Process width, I never heard such name before, it should be from your process capibility. According to the formula, the "s" means standard deviation. the calculation method by Excel is so simple: "=stdev("range")".
Any questions please let me know.