S Control Chart.

Description

This function builds a S control chart.

Usage

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cchart.S(x, type = "n", m = NULL)

Arguments

x

The data to be plotted.

type

A character string specifying the type of S control chart to be plotted where "n" plots a S chart with normalized probability limits and "e" plots a S chart with exact limits.

m

The sample sizes. Only necessary in the control chart with exact (probability) limits.

Details

The exact limits are the alpha/2 and 1-alpha/2 quantiles of the S distribution which is proportional to the square root of a chi-square distribution.

Value

Return a S control chart.

Author(s)

Daniela R. Recchia, Emanuel P. Barbosa

Examples

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data(softdrink)
#S chart with normalized probability limits
cchart.S(softdrink, type = "n")
#S chart with exact probability limits
cchart.S(softdrink, type = "e", 10)