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

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        852        8.52        8.52
          2 |          3        0.03        8.55
          3 |         14        0.14        8.69
          4 |          1        0.01        8.70
          5 |         81        0.81        9.51
          6 |          1        0.01        9.52
          7 |          3        0.03        9.55
          8 |      1,091       10.91       20.46
          9 |        138        1.38       21.84
         10 |         51        0.51       22.35
         11 |         14        0.14       22.49
         12 |      5,255       52.55       75.04
         13 |         73        0.73       75.77
         14 |        207        2.07       77.84
         15 |         18        0.18       78.02
         16 |         24        0.24       78.26
         18 |         11        0.11       78.37
         19 |        130        1.30       79.67
         20 |        492        4.92       84.59
         21 |         85        0.85       85.44
         22 |        319        3.19       88.63
         23 |         78        0.78       89.41
         24 |        211        2.11       91.52
         25 |         44        0.44       91.96
         26 |         43        0.43       92.39
         27 |        305        3.05       95.44
         28 |        161        1.61       97.05
         29 |         26        0.26       97.31
         31 |        169        1.69       99.00
         32 |         32        0.32       99.32
         33 |         63        0.63       99.95
         99 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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