M
Mexicanquality
Gentleman,
I have been lately working for new customer and they have been pushing me to use Minitab to calculate Ppk, Cpk, etc, but my data aren´t Normal data (anderson test) and because of this I have to find the best distribution (weibull, largest, etc) or to tranform the data with Jhonson or Box cox.
My main questions are:
-Why Minitab doesn´t calculate the Cpk and Cp on Non normal data (is because the formules are based in normal data??)
-In some tranformations Minitab doesn´t calculate Pp, is there any reason?
-What is next if no one distribution or transformation fits to data? we assume nornamilty?
I know are a lot of questions but I think all of them are related.
Joe
I have been lately working for new customer and they have been pushing me to use Minitab to calculate Ppk, Cpk, etc, but my data aren´t Normal data (anderson test) and because of this I have to find the best distribution (weibull, largest, etc) or to tranform the data with Jhonson or Box cox.
My main questions are:
-Why Minitab doesn´t calculate the Cpk and Cp on Non normal data (is because the formules are based in normal data??)
-In some tranformations Minitab doesn´t calculate Pp, is there any reason?
-What is next if no one distribution or transformation fits to data? we assume nornamilty?
I know are a lot of questions but I think all of them are related.
Joe