Frequencies for first 10,000 rows of drugres2 variable in person dataset :

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,693       96.93       96.93
          1 |         37        0.37       97.30
        117 |          1        0.01       97.31
        147 |          1        0.01       97.32
        154 |          1        0.01       97.33
        155 |          3        0.03       97.36
        167 |          1        0.01       97.37
        177 |          3        0.03       97.40
        187 |         12        0.12       97.52
        189 |          1        0.01       97.53
        208 |          2        0.02       97.55
        300 |          1        0.01       97.56
        304 |          3        0.03       97.59
        321 |          3        0.03       97.62
        343 |          2        0.02       97.64
        348 |          4        0.04       97.68
        351 |          3        0.03       97.71
        355 |          1        0.01       97.72
        376 |          1        0.01       97.73
        401 |         13        0.13       97.86
        402 |          5        0.05       97.91
        407 |         48        0.48       98.39
        410 |         11        0.11       98.50
        417 |         78        0.78       99.28
        522 |          3        0.03       99.31
        600 |          4        0.04       99.35
        603 |          5        0.05       99.40
        605 |          2        0.02       99.42
        606 |          6        0.06       99.48
        695 |          6        0.06       99.54
        996 |         42        0.42       99.96
        997 |          1        0.01       99.97
        999 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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