IQCC (version 1.0)

Rexact: Exact R control chart.

Description

This function builds a R control chart with exact (probability) limits.

Usage

Rexact(x, y, m)

Arguments

x

The data to be plotted.

y

The data used in phase I to estimate the standard deviation.

m

The sample size.

Value

• Return a R control chart.

Details

The exact limits are the alfa/2 and 1-alfa/2 quantiles of the R distribution that are calculated as estimated process sd times the quantiles of the relative range (W=R/sigma) distribution.

See Also

Raprox

Examples

data(pistonrings)
attach(pistonrings)
Rexact(pistonrings[26:40,],pistonrings[1:25,],5)