CC (version 1.0)

xbarRCC: Computing xbar and R-chart Parameters

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"

References

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

See Also

plot.CC

Examples

# NOT RUN {
x <- matrix(rnorm(120, sd = 3), ncol=12)
x.R <- xbarRCC(x)
plot(x.R)
# }