How to add regression line equation and R2 on graph

0 votes

How to add regression line equation and R^2 on the ggplot. 

My code is as follows:

library(ggplot2)
df <- data.frame(x = c(1:100))
df$y <- 2 + 3 * df$x + rnorm(100, sd = 40)
p <- ggplot(data = df, aes(x = x, y = y)) +
            geom_smooth(method = "lm", se=FALSE, color="black", formula = y ~ x) +
            geom_point()
p

Thanks!

Jun 1, 2018 in Data Analytics by Sahiti
• 6,370 points
6,745 views

1 answer to this question.

0 votes

Below is one solution:

# GET EQUATION AND R-SQUARED AS STRING
# SOURCE: http://goo.gl/K4yh

lm_eqn <- function(df){
    m <- lm(y ~ x, df);
    eq <- substitute(italic(y) == a + b %.% italic(x)*","~~italic(r)^2~"="~r2, 
         list(a = format(coef(m)[1], digits = 2), 
              b = format(coef(m)[2], digits = 2), 
             r2 = format(summary(m)$r.squared, digits = 3)))
    as.character(as.expression(eq));                 
}

p1 <- p + geom_text(x = 25, y = 300, label = lm_eqn(df), parse = TRUE)

answered Jun 1, 2018 by DataKing99
• 8,250 points

Related Questions In Data Analytics

0 votes
4 answers

How to change font size of text and axes on R plots ?

To change the font size of text ...READ MORE

answered Dec 16, 2020 in Data Analytics by Gitika
• 65,770 points
122,782 views
0 votes
1 answer

How can I print string and variable contents on the same line using R?

There are two options for doing so.  You ...READ MORE

answered May 9, 2018 in Data Analytics by zombie
• 3,790 points
1,885 views
0 votes
1 answer

How do I add Icons to my messages on my dashboard which I’m creating using shiny r?

Try something like this: dashboardHeader(title="Edureka", dropdownMenu type = "message", messageItem(from = ...READ MORE

answered Nov 30, 2018 in Data Analytics by Maverick
• 10,840 points
885 views
0 votes
1 answer

How to add labels on bars in bar chart in ggplot?

Use geom_text() to add labels on the ...READ MORE

answered Aug 20, 2019 in Data Analytics by anonymous
• 33,030 points
3,977 views
0 votes
1 answer

How to plot side-by-side Plots with ggplot2 in R?

By Using gridExtra library we can easily ...READ MORE

answered Apr 16, 2018 in Data Analytics by DeepCoder786
• 1,720 points

edited Jun 9, 2020 by MD 8,866 views
0 votes
11 answers

Changing the legend title in ggplot

Hi, you can also try guides() to ...READ MORE

answered Jul 30, 2019 in Data Analytics by Cherukuri
• 33,030 points
17,700 views
0 votes
1 answer

How to order bars in a bar graph using ggplot2?

The key to ordering is to set ...READ MORE

answered Jun 1, 2018 in Data Analytics by DataKing99
• 8,250 points
1,195 views
0 votes
1 answer

How to create a box-plot using “plotly” in R?

You can use this command to create ...READ MORE

answered Jul 4, 2018 in Data Analytics by CodingByHeart77
• 3,750 points
7,843 views
0 votes
1 answer

How to check if a directory exists and how to create and create if doesn't exist?

You can use showWarnings = FALSE NOTE:  showWarnings ...READ MORE

answered Apr 17, 2018 in Data Analytics by DataKing99
• 8,250 points
2,601 views
0 votes
1 answer

How to filter a data frame with dplyr and tidy evaluation in R?

Requires the use of map_df to run each model, ...READ MORE

answered May 17, 2018 in Data Analytics by DataKing99
• 8,250 points
1,915 views
webinar REGISTER FOR FREE WEBINAR X
REGISTER NOW
webinar_success Thank you for registering Join Edureka Meetup community for 100+ Free Webinars each month JOIN MEETUP GROUP