stats.c(data, sizes)
sd.c(data, sizes, ...)
limits.c(center, std.dev, sizes, conf)
conf
> 1) or the confidence level (if 0 < conf
< 1).stats.c
returns a list with components statistics
and center
.The function sd.c
returns std.dev
the standard deviation of the statistic charted.The function limits.c
returns a matrix with lower and upper control limits.
qcc