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

      FIRST |
    HARMFUL |
      EVENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        838        8.38        8.38
          3 |         10        0.10        8.48
          5 |         49        0.49        8.97
          6 |          2        0.02        8.99
          7 |         32        0.32        9.31
          8 |      1,075       10.75       20.06
          9 |        203        2.03       22.09
         10 |         25        0.25       22.34
         11 |         26        0.26       22.60
         12 |      5,143       51.43       74.03
         13 |         73        0.73       74.76
         14 |         79        0.79       75.55
         15 |         51        0.51       76.06
         16 |          4        0.04       76.10
         17 |         20        0.20       76.30
         18 |         36        0.36       76.66
         19 |         11        0.11       76.77
         20 |          7        0.07       76.84
         21 |         17        0.17       77.01
         22 |          3        0.03       77.04
         23 |         20        0.20       77.24
         24 |        175        1.75       78.99
         25 |        115        1.15       80.14
         26 |          8        0.08       80.22
         27 |        108        1.08       81.30
         28 |          5        0.05       81.35
         29 |         27        0.27       81.62
         30 |        127        1.27       82.89
         31 |         76        0.76       83.65
         32 |         66        0.66       84.31
         33 |        394        3.94       88.25
         34 |        158        1.58       89.83
         35 |        118        1.18       91.01
         36 |         26        0.26       91.27
         37 |         36        0.36       91.63
         38 |        109        1.09       92.72
         39 |         52        0.52       93.24
         40 |          8        0.08       93.32
         41 |         24        0.24       93.56
         42 |        454        4.54       98.10
         43 |         50        0.50       98.60
         44 |          4        0.04       98.64
         45 |          3        0.03       98.67
         46 |         11        0.11       98.78
         47 |          3        0.03       98.81
         49 |          2        0.02       98.83
         51 |          1        0.01       98.84
         52 |         38        0.38       99.22
         53 |         33        0.33       99.55
         54 |         17        0.17       99.72
         57 |          5        0.05       99.77
         60 |          2        0.02       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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