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

  Emergency |
        Use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,967       99.67       99.67
          1 |         15        0.15       99.82
          9 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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