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

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,941       99.41       99.41
          1 |          1        0.01       99.42
        155 |          3        0.03       99.45
        167 |          1        0.01       99.46
        304 |          1        0.01       99.47
        321 |          4        0.04       99.51
        334 |          2        0.02       99.53
        343 |          1        0.01       99.54
        351 |          2        0.02       99.56
        358 |          1        0.01       99.57
        376 |          1        0.01       99.58
        401 |          1        0.01       99.59
        402 |          3        0.03       99.62
        403 |          1        0.01       99.63
        407 |          1        0.01       99.64
        410 |         10        0.10       99.74
        417 |          4        0.04       99.78
        600 |          1        0.01       99.79
        603 |          3        0.03       99.82
        606 |          1        0.01       99.83
        695 |          1        0.01       99.84
        702 |          1        0.01       99.85
        996 |         14        0.14       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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