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

  emergency |
        use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,969       99.69       99.69
          2 |          7        0.07       99.76
          4 |          1        0.01       99.77
          5 |          4        0.04       99.81
          6 |          2        0.02       99.83
          9 |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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