I assume you are using the qcc package's qcc function.
example(qcc) gives an example of adding abline's to its plot:
# add warning limits at 2 std. deviations
q <- qcc(diameter[1:25,], type="xbar", newdata=diameter[26:40,],
plot=FALSE)
(warn.limits <- limits.xbar(q$center, q$std.dev, q$sizes,
A) Without your data, it is very difficult to see what your problem is. You
need to include both data and code to create a reproducible example. [1][2][3]
B) Please follow the guidance in the Posting Guide mentioned in the footer of
every message on this list; in particular note that this is a p
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