How can I create a scatter plot using ggplot2 in R?

How can I create a scatter plot using ggplot2 in R?

To create a scatter plot in ggplot2, you can use the ggplot() function along with geom_point(). Here's a basic example:

library(ggplot2)

data(mtcars)

ggplot(mtcars, aes(x=wt, y=mpg)) + 
  geom_point() + 
  labs(title='Scatter Plot of Weight vs MPG', x='Weight', y='Miles Per Gallon')

What if I want to change the color of the points?

You can change the color of the points by adding the color aesthetic inside the aes() function. For example:

ggplot(mtcars, aes(x=wt, y=mpg, color=gear)) + 
  geom_point() + 
  labs(title='Scatter Plot of Weight vs MPG by Gear', x='Weight', y='Miles Per Gallon')

How do I add a regression line to the scatter plot?

You can add a regression line using geom_smooth(). Here's how you can do it:

ggplot(mtcars, aes(x=wt, y=mpg)) + 
  geom_point() + 
  geom_smooth(method='lm', se=FALSE, color='blue') + 
  labs(title='Scatter Plot with Regression Line', x='Weight', y='Miles Per Gallon')

Can I save the plot as an image file?

Yes, you can save the plot using the ggsave() function. For example:

ggsave('scatter_plot.png')