PextI {IQCC} | R Documentation |
This function builds an improved version (non-normal correction) of the p chart for phase I.
PextI(x, sizes, par, length)
x |
The data to be plotted. |
sizes |
A value or a vector of values specifying the sample sizes associated with each group. |
par |
The data used to estimate the phat (x/sizes). This data is used only in this phase. |
length |
The length of the data. |
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) PextI(par=pi[1:12],x=Di[1:12],sizes=ni[1:12],length=12)