Appendix 8 Calculations of Centerline and Control Limits for Control Charts
The following notation is used to define parameters used to compute centerline and control limits for different control charts.
Notations Common to Both Variables and Attributes Control Charts
n = the sample size (number of items in a subgroup)
m = the number of samples (or subgroups) in the data set used to set up a control chart
i = an item number in a sample (i varies from 1 to n)
j = a subgroup number (j varies from 1 to m).
Notations for Variables Control Charts
xij = a measurement of ith item in jth subgroup. (xijs’ are measurements of a product characteristic X [measured as a continuous variable], selected to monitor and improve the production process.) ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.