xLRCC {CC}

R Documentation

Computing x and LR-chart Parameters

Description

This function computes control limits for the x and LR-charts, optionally revising them in the case that individual sample means and/or ranges plot out of the trial control limits.

Usage

xLRCC(qc.obj, k=3, sigma, mu, revise=TRUE, newdata)

Arguments

qc.obj	an object of class CC
k	the control chart parameter governing the width of the control limits
sigma	(optional) an estimate of the in-control standard deviation
mu	(optional) an estimate of the in-control mean
revise	if TRUE, mu and sigma are estimated using only range values that plot inside the trial control limits
newdata	an n-vector consisting of data from new subgroups

Value

an object of class "CC"

Author(s)

W.J. Braun

References

Montgomery, D.C. (2000) Introduction to Statistical Quality Control, Wiley

See Also

plot.CC

Examples

rr.xLR <- xLRCC(rr$Avg)
plot(rr.xLR)

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