Frequencies for pm_harm variable in parkwork dataset :

       Most |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |          4        0.40        0.40
          7 |          1        0.10        0.50
          8 |         13        1.30        1.80
         12 |        588       58.68       60.48
         14 |        355       35.43       95.91
         15 |          1        0.10       96.01
         18 |          7        0.70       96.71
         19 |          5        0.50       97.21
         30 |          2        0.20       97.41
         45 |          7        0.70       98.10
         54 |         19        1.90      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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