geom_smooth lm line not drawn - ggplot2

Question

I'm trying to plot the lm line using this code

df <- data.frame(c1=factor(c(1,1,1,1,2,2,2,2,3,3,3,3)),c2=c(65,42,56,75,43,43,21,23,12,12,21,11)) p <- ggplot(aes(x=c1,y=c2),data=df) p + geom_point() + geom_smooth(method="lm")

But the lm line is not shown. Am I missing something?

Possible duplicate of stackoverflow.com/questions/15633714/… — akrun
– akrun, Commented May 5, 2018 at 14:56
Why is 'c1' a factor? Change it to numeric and you should be able to get the line — akrun
– akrun, Commented May 5, 2018 at 15:02
If you do happen to require a factor, set aes(group = 1). — Axeman
– Axeman, Commented May 5, 2018 at 15:03
@Axeman: Thanks, that was it! Could you turn your comment into an answer so that I can accept it? — HappyPy
– HappyPy, Commented May 5, 2018 at 15:06

NelsonGon · Accepted Answer · 2021-12-09 20:08:08Z

The reason is that c1 is a factor. Converting it to numeric will solve the problem

library(dplyr) library(ggplot2) df %>% mutate(c1 = as.numeric(as.character(c1)) %>% ggplot(aes(x = c1, y = c2)) + geom_point() + geom_smooth(method="lm")

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