Frequencies for first 10,000 rows of cylinder variable in vehicle dataset :

  Number of |
  Cylinders |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        582        5.82        5.82
          1 |         80        0.80        6.62
         10 |         46        0.46        7.08
          2 |        574        5.74       12.82
          3 |         12        0.12       12.94
          4 |      3,058       30.58       43.52
          5 |         57        0.57       44.09
          6 |      3,576       35.76       79.85
          8 |      2,014       20.14       99.99
          R |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016