Trying to work out a 2/3 sigma failure rule on a selection of data points
Nov 13, 2012 4:20 PM(4090 views)
I was wondering if someone could help me out. I have a raw data pull and I would like to try to manually work out if 2 out of the last 3 points is above 3 sigma. I already have worked out my control limits via control charts based on 4 pseudo screened data. If my UCL was 3.75 and I had the following values 2,3.9,4.2 (may not be in that order) then how would I be able to apply this rule to populate a variable to trigger the rule.