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$sizes, 2))
plot(q, restore.par = FALSE)
abline(h = warn.limits, lty = 3, col = "chocolate")
and help(qcc) describes the 'restore.par' argument:
restore.par: a logical value indicating whether the previous ‘par’
settings must be restored. If you need to add points, lines,
etc. to a control chart set this to ‘FALSE’.
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Mon, Jan 29, 2018 at 3:49 AM, a.antonini...@hotmail.com <
a.antonini...@hotmail.com> wrote:
> Good morning,
> I have some problem adding ablines in Rstudio.
> The lines drew by the software doesen’t match with the added values, what
> can I do?
>
> pfaOK<-qcc(D[!trial], sizes=size[!trial], type="p", nsigmas=2,
> data.name="Polli
> positivi al Campylobacter")
> pfaOK1<-qcc(D[!trial], sizes=size[!trial], type="p", data.name="Polli
> positivi al Campylobacter")
>
> abline(h=pfaOK$limits[1], lty=1, col="red")
> abline(h=pfaOK$limits[2], lty=1, col="red")
>
> abline(h=0.02204175, col="red")
> abline(h=0.1996249, col="red")
>
> abline(h=2.204175, col="red")
> abline(h=19.96249, col="red")
>
> Thanks for the attention,
> Arianna
>
> Inviato da Posta<https://go.microsoft.com/fwlink/?LinkId=550986> per
> Windows 10
>
>
> [[alternative HTML version deleted]]
>
>
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> and provide commented, minimal, self-contained, reproducible code.
>
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