Way ahead of ya
But seriously, I've been doing these for years. I just never bothered to toally understand them. I get the basic ideas, but the specifics allude me.
So first a specific question. When doing a study, are subgroups ALWAYS used? I was taught the basic by an older gentleman that is no longer with us and he never mentioned it. The idea I am getting from the articles is that rather than going up to my process and snagging 30 samples/entering the data in one group/ and finally getting the CpK..........I should be doing like 6 subgroups of 5 parts taken at different times? Is this correct?
One program I have will only let me chart subgroups as opposed to one group of all the parts, so I am wondering if this is the industry standard? I (prior to this) expected to just enter the values from x parts and get a CpK number. What am I missing?