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

Special Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,946       99.46       99.46
          1 |          4        0.04       99.50
          3 |          1        0.01       99.51
          4 |          4        0.04       99.55
          5 |         23        0.23       99.78
          9 |         22        0.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016