Frequencies for pharm_ev variable in parkwork dataset :

      First |
    Harmful |
      Event |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         30        2.99        2.99
          2 |          2        0.20        3.19
          7 |          1        0.10        3.29
          8 |         81        8.08       11.38
          9 |         12        1.20       12.57
         10 |          1        0.10       12.67
         11 |          1        0.10       12.77
         12 |        202       20.16       32.93
         14 |        400       39.92       72.85
         15 |          1        0.10       72.95
         18 |         15        1.50       74.45
         19 |         11        1.10       75.55
         20 |          2        0.20       75.75
         24 |          7        0.70       76.45
         25 |          7        0.70       77.15
         30 |         24        2.40       79.54
         31 |         11        1.10       80.64
         32 |          6        0.60       81.24
         33 |         61        6.09       87.33
         34 |         11        1.10       88.42
         35 |          2        0.20       88.62
         38 |          4        0.40       89.02
         39 |          4        0.40       89.42
         40 |          1        0.10       89.52
         41 |          4        0.40       89.92
         42 |         18        1.80       91.72
         43 |         13        1.30       93.01
         44 |          1        0.10       93.11
         45 |         20        2.00       95.11
         46 |          1        0.10       95.21
         48 |          4        0.40       95.61
         52 |          1        0.10       95.71
         53 |         20        2.00       97.70
         58 |          9        0.90       98.60
         59 |         14        1.40      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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