Functions specifying rules for Shewhart charts

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Description

These functions are used to signal out of control points in Shewhart charts.

Usage

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shewhart.rules(object, limits = object$limits, run.length = qcc.options("run.length"))
beyond.limits(object, limits = object$limits)
violating.runs(object, run.length = qcc.options("run.length"))

Arguments

object

an object of class 'qcc'.

limits

control limits

run.length

the maximum value of a run before to signal a point as out of control.

Details

The function shewhart.rules simply calls the beyond.limits and violating.runs functions which actually do the real calculations.

Value

The shewhart.rules function returns a list with components:

beyond.limits

the indices of points beyond control limits.

violating.runs

the indices of points violating runs.

Author(s)

Luca Scrucca luca@stat.unipg.it

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