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

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,804       98.04       98.04
          1 |         24        0.24       98.28
        128 |          1        0.01       98.29
        155 |          1        0.01       98.30
        167 |          1        0.01       98.31
        187 |          1        0.01       98.32
        208 |          2        0.02       98.34
        300 |          4        0.04       98.38
        303 |          1        0.01       98.39
        304 |          2        0.02       98.41
        313 |          1        0.01       98.42
        321 |         11        0.11       98.53
        334 |          1        0.01       98.54
        343 |          2        0.02       98.56
        351 |         10        0.10       98.66
        352 |          1        0.01       98.67
        358 |          4        0.04       98.71
        401 |          1        0.01       98.72
        402 |          4        0.04       98.76
        407 |         13        0.13       98.89
        410 |          1        0.01       98.90
        417 |         37        0.37       99.27
        419 |          1        0.01       99.28
        423 |          1        0.01       99.29
        600 |          6        0.06       99.35
        603 |          7        0.07       99.42
        605 |          2        0.02       99.44
        606 |          6        0.06       99.50
        695 |          2        0.02       99.52
        996 |         37        0.37       99.89
        999 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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