RCC {CC}

R Chart Parameters

Description

This function computes control limits for R-charts, optionally revising them in the case that ranges plot out of the trial control limits.

Usage

RCC(R, n, k=3, sigma)

Arguments

R

a numeric vector consisting of the subgroup ranges

n

the subgroup size

k

the control chart parameter governing the width of the control limits

sigma

(optional) an estimate of the in-control standard deviation

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)