Attribute , for example C chart

Bev D

Heretical Statistician
Staff member
Super Moderator
#11
Your books are wrong about SPC which is a family of statistics called analytic statistics. What you are referring to is enumeration statistics. I would have to see your data to know how best to chart it.
Read the works of Donald Wheeler
 
Elsmar Forum Sponsor
#14
And to be clear: what you are saying is, in the family of statistics called analytic statistics, I am allowed to chart non independent data and turn on WE rules. And what I was referring to is enumeration statistics I can not run statistics over dependent data?
Will see if I can share some Tencor Surfscan data.
 

Ninja

Looking for Reality
Staff member
Super Moderator
#15
On the chart view of JMP, right click and you get a whole new menu...one of the options is something like "Graph options" or "chart options" (assuming you're in an IR chart).
That control panel lets you manually set the control limits and add other fixed lines...at least it did in JMP 8 and 9...the last time I used it.
 

Mike S.

Happy to be Alive
Trusted Information Resource
#16
Bev is right -- read Donald Wheeler. Much of his statistical wisdom is available for free at Quality Digest - do a search on there. Davis Balestracci is another good practical statistician with many articles in QD.
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#17
So a few points from this thread - the control limits are from the data. You can't "put them where you want them". I have run into several folks about "Why do I want a control limit in the good direction - I don't want to limit people from getting to zero defects". The key about having a control limit in the "good" direction is it gives me a definite signal when the process has significantly improved.

Also, it is true that SPC should be used on "independent" data from time interval to time interval. Usually with knowledge of the process, you can account for the dependency. For example, inventories (maintenance backlogs as an example) are notorious for somethings gets counted over and over every month. In inventory cases, I may plot a run chart of the inventory so I know what it is, but then plot either the change in inventory every month, or the actually input rate and the actual output rate, along with the cycle time of the process (SPC chart), and average age of what is open at the end of a month (run chart).
 
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