# Patrick Detroit

## Activity

• Hi Chris,
Maybe you can answer a question I was recently asked. Why is Cp/Cpk a 2.0 ratio? I explained the math, that the USL-LSL is a measure of +-6 sigma (12 sigmas) over the denominator that is only 6 sigma. My follow on question… is there a reason we use a 2.0 scale? If we used a denominator of 12 sigma the scale would be just as…[Read more]

• Hi Karim, I don’t consider myself an expert, but I’ll try to answer the best I can. How the denominators are calculated for Cp/Cpk and Pp/Ppk will answer your question. The denominator for Cp/Cpk uses a pooled Stdev or Stdev(within) that is calculated by obtaining the square root of the sum of subroup stdev’s. The denominator for Pp/Ppk is the…[Read more]

• Patrick Detroit replied to the topic in the forum Patrick Detroit 5 years, 6 months ago

Hi Darrell,

Any luck?

Regards,
Patrick

• Patrick Detroit replied to the topic in the forum Patrick Detroit 5 years, 6 months ago

Hi Darrell,

There are so many ways to go about learning “six sigma.” I would say both Pilla and Chris are giving you great advice. With your background in LEAN, you may already know quite a bit about it already. If you’re not versed in statistics you might want to brush up on it before taking a formal class. For the ASQ exam you will need to…[Read more]

• 5S Implementation Strategy

I was talking to a friend the other day and he was mentioning a conversation he had with a client concerning the 5S’s. The client said that they’ve tried it a few times but it never stuck. I quietly went home and started thinking about the 5S’s and began asking myself some questions. The first question we alway…[Read more]

• Patrick Detroit became a registered member 6 years ago