process.capability.sixpack {qcc}R Documentation

Process capability sixpack plots

Description

Draw a process capability sixpack plots.

Usage

process.capability.sixpack(object, spec.limits, target, nsigmas, std.dev)

Arguments

object a 'qcc' object of type "xbar"
spec.limits a vector specifying the lower and upper specification limits.
target a value specifying the target of the process. If missing the value from the 'qcc' object is used if not NULL, otherwise the target is set at the middle value bewteen specification limits.
nsigmas a numeric value specifying th number of sigmas to use. If not provided is taken from the 'qcc' object.
std.dev a value specifying the within-group standard deviation. If not provided is taken from the 'qcc' object.

Details

The process capability sixpack plots are:
a xbar chart
a R or S chart (if sample sizes > 10)
a run chart
a histogram
a normal Q-Q plot
a capability plot

Author(s)

Luca Scrucca luca@stat.unipg.it

References

Minitab (2000) Users's Guide 2: Data Analysis and Quality Tools, rel. 13, Chapter 14.

See Also

process.capability, qcc

Examples

x <- matrix(rnorm(100), ncol=5)
q <- qcc(x, type="xbar", plot=FALSE)
process.capability.sixpack(q, spec.limits = c(-2,2), target=0)

data(pistonrings)
attach(pistonrings)
diameter <- qcc.groups(diameter, sample)
q <- qcc(diameter[1:25,], type="xbar", nsigmas=3, plot=FALSE)
process.capability.sixpack(q, spec.limits=c(73.95,74.05))
[Package qcc version 2.0 Index]