R help - Aug 2023 - geom_smooth

Colleagues,

Here is my reproducible code for a graph using geom_smooth
set.seed(55)
scatter_data <- tibble(x_var = runif(100, min = 0, max = 25)
?????????????????????? ,y_var = log2(x_var) + rnorm(100))

library(ggplot2)
library(cowplot)

ggplot(scatter_data,aes(x=x_var,y=y_var))+
? geom_point()+
?
geom_smooth(se=TRUE,fill="blue",color="black",linetype="dashed")+
? theme_cowplot()

I'd like to add a black boundary around the shaded area. I suspect this can
be done with geom_ribbon but I cannot figure this out. Some advice would be
welcome.

Thanks!

Thomas Subia

?s 05:17 de 12/08/2023, Thomas Subia via R-help
escreveu:
> Colleagues,
> 
> Here is my reproducible code for a graph using geom_smooth
> set.seed(55)
> scatter_data <- tibble(x_var = runif(100, min = 0, max = 25)
>  ?????????????????????? ,y_var = log2(x_var) + rnorm(100))
> 
> library(ggplot2)
> library(cowplot)
> 
> ggplot(scatter_data,aes(x=x_var,y=y_var))+
>  ? geom_point()+
>  ?
geom_smooth(se=TRUE,fill="blue",color="black",linetype="dashed")+
>  ? theme_cowplot()
> 
> I'd like to add a black boundary around the shaded area. I suspect this
can be done with geom_ribbon but I cannot figure this out. Some advice would be
welcome.
> 
> Thanks!
> 
> Thomas Subia
> 
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
Hello,

Here is a solution. You ,ust access the computed variables, which you 
can with ?ggplot_build.
Then pass them in the data argument.



p <- ggplot(scatter_data,aes(x=x_var,y=y_var)) +
   geom_point()+
  
geom_smooth(se=TRUE,fill="blue",color="black",linetype="dashed")+
   theme_cowplot()

# this is a data.frame, relevant columns are x,  ymin and ymax
fit <- ggplot_build(p)$data[[2]]

p +
   geom_line(data = fit, aes(x, ymin), linetype = "dashed", linewidth
= 1) +
   geom_line(data = fit, aes(x, ymax), linetype = "dashed", linewidth
= 1)


Hope this helps,

Rui Barradas

G'day Thomas,

On Sat, 12 Aug 2023 04:17:42 +0000 (UTC)
Thomas Subia via R-help <r-help at r-project.org> wrote:
> Here is my reproducible code for a graph using geom_smooth
The call "library(tidyverse)" was missing. :)
> I'd like to add a black boundary around the shaded area. I suspect
> this can be done with geom_ribbon but I cannot figure this out. Some
> advice would be welcome.
This works for me:

ggplot(scatter_data,aes(x=x_var,y=y_var,))+
  geom_point()+
 
geom_smooth(se=TRUE,fill="blue",color="black",linetype="dashed")
+
  geom_ribbon(stat="smooth", aes(ymin=after_stat(ymin),
ymax=after_stat(ymax)), fill=NA, color="black")+
  theme_cowplot()

Cheers,
	
	Berwin