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mkchart
2010 Jan 13
1
plotting moving range control chart
...l to 2 points with
testType=1,
> data(rawWeight)
> ichart=spc(x=rawWeight$rawWeight, sg=2, type="i", name="weight",
testType=1)
> plot(ichart)
> summary(ichart)
Changing "type = 'i'" to "type = 'mr'" yields the moving chart:
> mrchart = spc(x = rawWeight$rawWeight, sg = 2, type = "mr", name =
"weight", testType = 1)
> plot(mrchart)
> summary(mrchart)
In separate tests, I have confirmed that qAnalyst correctly computes natural
process limits (a.k.a. "control limits") for X-bar and R charts, us...