xbarCC {CC}

xbar Chart Parameters

Description

This function computes control limits for the xbar charts, optionally revising them in the case that individual sample means plot outside the trial control limits.

Usage

xbarCC(xbar, n, sigma, k, mu)

Arguments

xbar

a numeric vector consisting of the subgroup averages

n

the subgroup size

k

the control chart parameter governing the width of the control limits

sigma

an estimate of the in-control standard deviation

mu

(optional) an estimate of the in-control mean

Value

a list consisting of the upper and lower control limits and the centerline.

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)
x.R <- xbarRCC(x, newdata=rnorm(12))
plot(x.R)