UextI {IQCC}R Documentation

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.

Author(s)

Daniela R. Recchia, Emanuel P. Barbosa

See Also

UextII

Examples

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

[Package IQCC version 1.0 Index]