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

  emergency |
        use |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,968       99.68       99.68
          2 |          4        0.04       99.72
          3 |          1        0.01       99.73
          4 |          3        0.03       99.76
          5 |         11        0.11       99.87
          8 |          6        0.06       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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