PextII {IQCC} | R Documentation |
This function builds an improved version (non-normal correction) of the p chart for phase II.
PextII(x, sizes, phat, length)
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. |
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.
Return an exact p chart.
Daniela R. Recchia, Emanuel P. Barbosa
Chen,G.(1998). An improved p chart through simple adjustment. Journal of Quality Technology, vol 30, pp 142-151.
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)