Frequencies for pm_harm variable in parkwork dataset :

       most |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.17        0.17
          2 |          8        0.70        0.87
          3 |          1        0.09        0.96
          8 |         19        1.66        2.62
         10 |          1        0.09        2.71
         12 |        955       83.33       86.04
         14 |        123       10.73       96.77
         16 |          2        0.17       96.95
         18 |          5        0.44       97.38
         19 |          2        0.17       97.56
         30 |          2        0.17       97.73
         31 |          1        0.09       97.82
         43 |          1        0.09       97.91
         45 |          6        0.52       98.43
         55 |          8        0.70       99.13
         73 |          8        0.70       99.83
         99 |          2        0.17      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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