Cpk - Determining what my d2 value is

F

fazarri

#1
Hi
First of all thank you in advance for your support
I'm working on a program(made in visual basic language) to record data during a production batch
I recorded this data automatically in an excel fiel , but to obtain some SPC values ,like cpk, ppk,.... we need to know my d2 value.

My process ( plastic-blow molding ) ,is made with 2 cavities per mould , and we are taking 2 measurements of weight (1 per cavitie ) each 2 hours , during 20 days
I know that d2 is a constant that depends on the number of data points in subgroups and on the number of data points in the sample.

in my case ...What is my d2 value ???where can i found this value???

Thanks
 
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B

Bezerra

#3
Re: Help: CPk ... what is my d2 value??

your d2 will be 1,128
if you need the full table of values tell me
 
F

fazarri

#4
Re: Help: CPk ... what is my d2 value??

Thank you a lot .
Is posible send to me a fulltale or d2?? how many groups and subgrop must I consider
 
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