ggplot geom_smooth colour

Hi

Yes i had look at this but it doesnt quite do what i am wanting. I do not
want the smoothed line to be coloured, or dependant on a factor or the
default blue.

An example,

library(ggplot2)

df<-data.frame(y=rnorm(100,30,10),x=rnorm(100,20,5),treat=factor(rbinom(100,1,0.5)))
	
	p1<-ggplot(df, aes(x=x, y=y,group=treat))   + theme_bw() +
	geom_smooth(aes(linetype=treat),method="lm", se=FALSE, fullrange=T,size=1) 
+ 
geom_point(aes(shape=treat),size=3) + 
	scale_shape_manual(values=c(1,16))

	p1

The fitted lines are blue - whereas i wish them to be black.

Adding colour="black" into the geom_smooth aesthetic does not change the
line colour to black.

thanks, sy
soon yi wrote

Hi

I am using geom_smooth to fit linear regression lines over a scatterplot
for two treatment groups. The default colour for the two lines are blue. I
have been unable to change this with the usual options. A search online
has not suggested any solution / work around.

Is there a solution to this?

many thanks, sy

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