Syntax error How to create multiple regression lines using ggplot2 in R?\\n

How to create multiple regression lines using ggplot2 in R?\\n

To create multiple regression lines using ggplot2, we can use grouping inside aes.

For example, if we have a data frame called that contains two numerical columns say x and y and a categorical column say C then the regression lines between x and y for all the categories in C can be created by using the below given command −

ggplot(df,aes(x,y,group=C))+geom_point()+stat_smooth(method="lm")

Example

Following snippet creates a sample data frame −

data(mtcars)
head(mtcars,20)

Output

The following dataframe is created −

                   mpg  cyl disp   hp drat  wt    qsec   vs am gear carb
Mazda RX4          21.0  6  160.0 110 3.90  2.620 16.46  0  1   4   4
Mazda RX4 Wag      21.0  6  160.0 110 3.90  2.875 17.02  0  1   4   4
Datsun 710         22.8  4  108.0  93 3.85  2.320 18.61  1  1   4   1
Hornet 4 Drive     21.4  6  258.0 110 3.08  3.215 19.44  1  0   3   1
Hornet Sportabout  18.7  8  360.0 175 3.15  3.440 17.02  0  0   3   2
Valiant            18.1  6  225.0 105 2.76  3.460 20.22  1  0   3   1
Duster 360         14.3  8  360.0 245 3.21  3.570 15.84  0  0   3   4
Merc 240D          24.4  4  146.7  62 3.69  3.190 20.00  1  0   4   2
Merc 230           22.8  4  140.8  95 3.92  3.150 22.90  1  0   4   2
Merc 280           19.2  6  167.6 123 3.92  3.440 18.30  1  0   4   4
Merc 280C          17.8  6  167.6 123 3.92  3.440 18.90  1  0   4   4
Merc 450SE         16.4  8  275.8 180 3.07  4.070 17.40  0  0   3   3
Merc 450SL         17.3  8  275.8 180 3.07  3.730 17.60  0  0   3   3
Merc 450SLC        15.2  8  275.8 180 3.07  3.780 18.00  0  0   3   3
Cadillac Fleetwood 10.4  8  472.0 205 2.93  5.250 17.98  0  0   3   4
Lincoln Continental 10.4 8  460.0 215 3.00  5.424 17.82  0  0   3   4
Chrysler Imperial  14.7  8  440.0 230 3.23  5.345 17.42  0  0   3   4
Fiat 128           32.4  4   78.7  66 4.08  2.200 19.47  1  1   4   1
Honda Civic        30.4  4   75.7  52 4.93  1.615 18.52  1  1   4   2
Toyota Corolla     33.9  4   71.1  65 4.22  1.835 19.90  1  1   4   1

To load ggplot2 package and create multiple regression lines between hp and mpg based on categories in cyl, add the following code to the above snippet −

library(ggplot2)
ggplot(mtcars,aes(hp,mpg,group=cyl))+geom_point()+stat_smooth(method="lm")
`geom_smooth()` using formula 'y ~ x'

Output

If you execute all the above given snippets as a single program, it generates the following Output −

Updated on: 2021-11-03T08:18:41+05:30

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