Frequencies for first 10,000 rows of drugres3 variable in person dataset :

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,869       98.69       98.69
          1 |          3        0.03       98.72
        100 |          1        0.01       98.73
        136 |          1        0.01       98.74
        187 |          2        0.02       98.76
        208 |          2        0.02       98.78
        304 |          1        0.01       98.79
        321 |          1        0.01       98.80
        348 |          3        0.03       98.83
        351 |          3        0.03       98.86
        367 |          1        0.01       98.87
        376 |          3        0.03       98.90
        401 |          6        0.06       98.96
        407 |          6        0.06       99.02
        410 |         18        0.18       99.20
        417 |         15        0.15       99.35
        425 |          1        0.01       99.36
        603 |          2        0.02       99.38
        606 |          5        0.05       99.43
        695 |         10        0.10       99.53
        702 |          2        0.02       99.55
        996 |         34        0.34       99.89
        999 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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