[R] Using ggplot2 geom_path() in a grouped variable

[Norberto Hernandez]

Rui:

Thank you very much for your help! It works the way you do. My problem
was with the time I declare the control group:

My code:
p <- ggplot(data, aes(Pretrend, Outcome))
+ geom_point(aes(colour=factor(Control))

Your solution:
p <- ggplot(data, aes(Pretrend, Outcome, colour = factor(Control)))
+ geom_point()

I believe that the time you are declaring the control group (inside
the ggplot() function instead the geom_point()) makes your code do the
right way and that my code links the last observation of group zero
with the first observation of group one.

Thank you Rui, and thanks all of you guys for take the time to read
and answer my post.

Regards
Norberto

El mar., 12 feb. 2019 a las 16:22, Rui Barradas
(<ruipbarradas using sapo.pt>) escribió:
>
> Hello,
>
> I am not understanding the problem.
> With a made up dataset everything seems right.
>
> set.seed(1234)    # make the results reproducible
> n <- 10
> data <- data.frame(Pretrend = rep(1:10, 2),
>                     Outcome = 1:10 + rnorm(2*n),
>                     Control = rep(1:2, each = n))
>
>
> library(ggplot2)
>
> p <- ggplot(data, aes(Pretrend, Outcome, colour = factor(Control))) +
>    geom_point() +
>    geom_path() +
>    labs(x = "Date", y = "Cases", title = "Intoxication Cases")
>
> p
>
>
> I have changed the plot name because 'plot' is the name of a base R
> function.
>
> What is the problem with the graph above? Is that what you were looking
> for? (Or similar.)
>
>
> Hope this helps,
>
> Rui Barradas
>
>
>
> Às 20:09 de 12/02/2019, Norberto Hernandez escreveu:
> > Hi! I am trying to make a scatter/path graph in one variable that is
> > divided in two groups (variable Control), but when I use the
> > geom_path() option, the line continues from the group one to the group
> > two, and I wasn't able to avoid it.I need the path draws over the
> > group one and then draws over the group two avoiding the connection
> > between the last value of group one and the first value of group two.
> >
> > This is my code
> >
> > library(ggplot2)
> > plot <- ggplot(data, aes(Pretrend, Outcome)) + geom_point()
> > plot + geom_point(aes(colour=factor(Control)))+labs(x="Date",
> > y="Cases", title="Intoxication Cases")+geom_path()
> >
> > Could you please bring be some advice.
> > Regards
> > Norberto Francisco Hernández
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