IQCC (version 1.0)

UextI: Exact (improved) u chart for phase I.

Description

This function builds an improved version of the Shewhart u chart where the traditional normal-based control limits are corrected for the non-normality of the u-statistic for phase I.

Usage

UextI(x, sizes, par, length)

Arguments

x

The data (counts) 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.

Value

• Return the improved U chart.

See Also

UextII

Examples

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