How to interpret Minitab Results? What is difference in Cpk and Ppk values?

A

Aashish

#1
Hi,

I have done the process capability studies on the Consumption of coke in the Pig iron industry using Minitab software.

The results were:

Cpk: 0.02
Ppk: 0.01
Stdev (within) : 14.07
Stdev (overall) : 17.13


Can someone please explain me the following:

1) What is difference in Cpk and Ppk values???

2) In the graph of process capability, what is difference between within (redline) and overall (black dotted line).
 
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Jim Wynne

Staff member
Admin
#2
Hi,

I have done the process capability studies on the Consumption of coke in the Pig iron industry using Minitab software.

The results were:

Cpk: 0.02
Ppk: 0.01
Stdev (within) : 14.07
Stdev (overall) : 17.13


Can someone please explain me the following:

1) What is difference in Cpk and Ppk values???

2) In the graph of process capability, what is difference between within (redline) and overall (black dotted line).
Have a look at About STDev in Minitab 13 and in particular the links in Atul Khandekar's post.

The information should also be applicable to more recent versions of Minitab.

Because what you're analyzing isn't clear, you might want to give us more information about what you're doing and perhaps post your data.

ETA: I see now that your question has been asked and answered in this thread. It's a good idea to avoid concurrently posting duplicate questions in different threads.
 
K

knowwareman

#3
Cp and Cpk are calculated using an estimation of Stdev based on Rbar/d2.
Pp and Ppk are calculated using Stdev.

Cp < 1 and Pp < 1 means that the process will not fit within the spec limits.
Cpk < 1 and Ppk < 1 means that the process is not centered.
 
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