'prt':	32 obs. of 11 variables in 2 partitions:
 $ mpg : num  21 21 22.8 21.4 18.7 18.1 14.3 24.4 22.8 19.2 17.8 16.4 17.3 15.2 10.4 10.4 14.7 32.4 30.4 33.9 21.5 15.5 15.2 13| __truncated__
 $ cyl : num  6 6 4 6 8 6 8 4 4 6 6 8 8 8 8 8 8 4 4 4 4 8 8 8 8 4 4 4 8 6 8 4
 $ disp: num  160 160 108 258 360 225 360 146.7 140.8 167.6 167.6 275.8 275.8 275.8 472 460 440 78.7 75.7 71.1 120.1 318 304 35| __truncated__
 $ hp  : num  110 110 93 110 175 105 245 62 95 123 123 180 180 180 205 215 230 66 52 65 97 150 150 245 175 66 91 113 264 175 335 109
 $ drat: num  3.9 3.9 3.85 3.08 3.15 2.76 3.21 3.69 3.92 3.92 3.92 3.07 3.07 3.07 2.93 3 3.23 4.08 4.93 4.22 3.7 2.76 3.15 3.73| __truncated__
 $ wt  : num  2.62 2.88 2.32 3.21 3.44 3.46 3.57 3.19 3.15 3.44 3.44 4.07 3.73 3.78 5.25 5.42 5.34 2.2 1.61 1.83 2.46 3.52 3.44| __truncated__
 $ qsec: num  16.5 17 18.6 19.4 17 20.2 15.8 20 22.9 18.3 18.9 17.4 17.6 18 18 17.8 17.4 19.5 18.5 19.9 20 16.9 17.3 15.4 17.1 | __truncated__
 $ vs  : num  0 0 1 1 0 1 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 0 1 0 0 0 1
 $ am  : num  1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 1 1 1 1 1 1
 $ gear: num  4 4 4 3 3 3 3 4 4 4 4 3 3 3 3 3 3 4 4 4 3 3 3 3 3 4 5 5 5 5 5 4
 $ carb: num  4 4 1 1 2 1 4 2 2 4 4 3 3 3 4 4 4 1 2 1 1 2 2 4 2 1 2 2 4 6 8 2
