PextII {IQCC}R Documentation

Exact (improved) p chart for phase II.

Description

This function builds an improved version (non-normal correction) of the p chart for phase II.

Usage

PextII(x, sizes, phat, length)

Arguments

x The data to be plotted.
sizes A value or a vector of values specifying the sample sizes associated with each group.
phat The estimate of p.
length The length of the data.

Details

To use this function it is necessary to have the information about the PextI. The non-normal correction considered is based on the Cornish-Fisher formula using cumulants until 3rd order.

Value

Return an exact p chart.

Author(s)

Daniela R. Recchia, Emanuel P. Barbosa

References

Chen,G.(1998). An improved p chart through simple adjustment. Journal of Quality Technology, vol 30, pp 142-151.

See Also

PextI

Examples

data(binomdata)
attach(binomdata)
pexI<-PextI(x=Di[1:12],sizes=ni[1:12],par=pi[1:12],length=12)
PextII(x=Di[1:12],sizes=ni[1:12],phat=pexI[1],length=12)

[Package IQCC version 1.0 Index]