Consider the
mtcars
data set which is available in
R
. Type the following code to explore the variables included in the data set (for an explanation of the variables see
?mtcars
:
## Rows: 32
## Columns: 11
## $ mpg 21.0, 21.0, 22.8, 21.4, 18.7, 18.1, 14.3, 24.4, 22.8, 19.2, 17.8,~ ##$cyl 6,6,4,6,8,6,8,4,4,6,6,8,8,8,8,8,8,4,4,4,4,8,~ ## $ disp 160.0, 160.0, 108.0, 258.0, 360.0, 225.0, 360.0, 146.7, 140.8, 16~ ## $ hp 110, 110, 93, 110, 175, 105, 245, 62, 95, 123, 123, 180, 180, 180~ ## $ drat 3.90, 3.90, 3.85, 3.08, 3.15, 2.76, 3.21, 3.69, 3.92, 3.92, 3.92,~ ## $ wt 2.620, 2.875, 2.320, 3.215, 3.440, 3.460, 3.570, 3.190, 3.150, 3.~ ## $ qsec 16.46, 17.02, 18.61, 19.44, 17.02, 20.22, 15.84, 20.00, 22.90, 18~ ##$vs 0,0,1,1,0,1,0,1,1,1,1,0,0,0,0,0,0,1,1,1,1,0,~ ##$am 1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,~ ## $ gear 4, 4, 4, 3, 3, 3, 3, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 4, 4, 4, 3, 3,~ ## $ carb 4, 4, 1, 1, 2, 1, 4, 2, 2, 4, 4, 3, 3, 3, 4, 4, 4, 1, 2, 1, 1, 2,~
Use the following code to create a new variable named
car_model
that contains the names of the cars, now available as row names.
## Rows: 32
## Columns: 12
## $ car_model "Mazda RX4", "Mazda RX4 Wag", "Datsun 710", "Hornet 4 Drive"~