UchartI {IQCC}R Documentation

Traditional Shewhart u chart for phase I.

Description

This function builds the traditional Shewhart u chart based on normal approx. for the Poisson-based count data statistic . It is designed for phase I.

Usage

UchartI(x, sizes, par, length)

Arguments

x The data to be plotted.
sizes A value or a vector of values specifying the sample sizes associated with each group.
par The sample ratios used to estimate the Poisson parameter(lambda).
length The length of the data.

Details

It is important to note that the normal approx. involved is valid only for n.p large. For small n.p , it should be used an "improved u chart" (with non-normal correction) given by the function "UextI" for phase-I or "UextII" for phase II .

Value

Return a traditional U control chart.

Author(s)

Daniela R. Recchia, Emanuel P. Barbosa

See Also

UchartII

Examples

data(moonroof)
attach(moonroof)
UchartI(par=ui[1:17],x=yi[1:17],sizes=ni[1:17],17)

[Package IQCC version 1.0 Index]