qcc.groups {qcc} | R Documentation |
This function allows to easily group data to use as input to the 'qcc' function.
qcc.groups(data, sample)
data |
the observed data values |
sample |
the sample indicators for the data values |
The function returns a matrix of suitable dimensions. If one or more group have few observations than others, NA
values are appended.
Luca Scrucca
data(pistonrings)
attach(pistonrings)
# 40 sample of 5 obs each
qcc.groups(diameter, sample)
# some obs are removed, the result is still a 40x5 matrix but with NAs added
qcc.groups(diameter[-c(1,2,50,52, 199)], sample[-c(1,2,50,52, 199)])