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

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,260       92.60       92.60
          1 |          3        0.03       92.63
        100 |          1        0.01       92.64
        128 |          1        0.01       92.65
        155 |          3        0.03       92.68
        167 |          1        0.01       92.69
        177 |          1        0.01       92.70
        187 |          6        0.06       92.76
        189 |          2        0.02       92.78
        300 |          3        0.03       92.81
        304 |          3        0.03       92.84
        307 |          1        0.01       92.85
        321 |          8        0.08       92.93
        343 |          3        0.03       92.96
        348 |          1        0.01       92.97
        351 |          9        0.09       93.06
        358 |          3        0.03       93.09
        376 |          1        0.01       93.10
        387 |          1        0.01       93.11
        401 |         23        0.23       93.34
        402 |         19        0.19       93.53
        407 |         27        0.27       93.80
        408 |          1        0.01       93.81
        410 |          9        0.09       93.90
        417 |         84        0.84       94.74
        515 |          1        0.01       94.75
        600 |          8        0.08       94.83
        603 |          9        0.09       94.92
        605 |          2        0.02       94.94
        606 |         35        0.35       95.29
        695 |         13        0.13       95.42
        996 |         25        0.25       95.67
        997 |          9        0.09       95.76
        999 |        424        4.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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