What is an I-Chart? An Individuals Control Chart?

D

dbulak

#1
Does anyone know where I can get information on an I-chart? Ihave gone to the search but nothing comes up.
 
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R

Rob Nix

#2
It might very well be an Individuals chart, generally working in conjunction with a moving range. Steve Prevette can tell you a LOT about them. It's been awhile for me.
 

Steve Prevette

Deming Disciple
Staff member
Super Moderator
#4
Rob Nix said:
It might very well be an Individuals chart, generally working in conjunction with a moving range. Steve Prevette can tell you a LOT about them. It's been awhile for me.
Generally I have seen them referred to as "x charts" or "x individuals charts". Yes, that is what I mostly do hear at Hanford since most of my data doesn't lend itself to rational subgroups, and most managers want to work on a weekly or monthly time increment.

http://www.hanford.gov/safety/vpp/xchart.htm
 

Tim Folkerts

Super Moderator
#5
I thought this was an I chart! :biglaugh:



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Tim F

 

Statistical Steven

Statistician
Staff member
Super Moderator
#6
My initial response was going to be an I chart is used by an I doctor :D

I just wanted to make a general comment about using a X/movR versus a Xbar/R or Xbar/S chart. Individual charts use between measurement error while R and S charts measure the within measurement error. I actually advise clients to use both charts with the same data. First do a R or S chart to make sure that the within variability is in control. Then use the mean of the measurements and plot an individual chart to see how the between measurement error is behaving.
 
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