Frequencies for pm_harm variable in parkwork dataset :

       most |
    harmful |
      event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          4        0.37        0.37
          2 |          2        0.18        0.55
          3 |          1        0.09        0.64
          8 |         13        1.19        1.84
         12 |        971       89.16       91.00
         14 |         68        6.24       97.25
         15 |          1        0.09       97.34
         18 |         13        1.19       98.53
         19 |          2        0.18       98.71
         33 |          1        0.09       98.81
         38 |          1        0.09       98.90
         42 |          1        0.09       98.99
         45 |          5        0.46       99.45
         55 |          2        0.18       99.63
         73 |          3        0.28       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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