xbarRCC: Computing xbar and R-chart Parameters

In CC: Control Charts

Description

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

Usage

xbarRCC(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 or matrix having n columns, 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

x <- matrix(rnorm(120, sd = 3), ncol=12)
x.R <- xbarRCC(x)
plot(x.R)

CC documentation built on Aug. 27, 2019, 9:02 a.m.