UstdI: Standardized Shewhart u chart for phase I.

Description

This function builds a standardized version of the u control chart for phase I.

Usage

UstdI(par, sizes, length)

Arguments

par

The sample ratios used to estimate the Poisson parameter(lambda).

sizes

A value or a vector of values specifying the sample sizes associated with each group.

length

The length of the data.

Value

Return a standardized u chart.

Details

The standardized version of the u statistic has zero mean and unitary standard deviation, so that the center line is zero and the 3-sigma control limits are -3 and +3.

Examples

Run this code

data(moonroof)
attach(moonroof)
UstdI(par=ui[1:17],sizes=ni[1:17],length=17)