Frequencies for first 10,000 rows of drugres1 variable in person dataset :

  DRUG TEST |
  RESULTS-1 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,524       75.24       75.24
          1 |      1,421       14.21       89.45
        100 |          4        0.04       89.49
        128 |          3        0.03       89.52
        154 |          1        0.01       89.53
        155 |          1        0.01       89.54
        177 |          6        0.06       89.60
        187 |          2        0.02       89.62
        208 |          4        0.04       89.66
        295 |          3        0.03       89.69
        303 |          2        0.02       89.71
        304 |          5        0.05       89.76
        307 |          1        0.01       89.77
        308 |          1        0.01       89.78
        321 |          9        0.09       89.87
        343 |          1        0.01       89.88
        355 |          1        0.01       89.89
        358 |          3        0.03       89.92
        401 |         26        0.26       90.18
        402 |         11        0.11       90.29
        407 |         29        0.29       90.58
        417 |         31        0.31       90.89
        423 |          1        0.01       90.90
        600 |          1        0.01       90.91
        603 |         19        0.19       91.10
        605 |          4        0.04       91.14
        606 |          9        0.09       91.23
        695 |          3        0.03       91.26
        702 |          4        0.04       91.30
        795 |          1        0.01       91.31
        940 |          1        0.01       91.32
        996 |         25        0.25       91.57
        997 |         49        0.49       92.06
        998 |          6        0.06       92.12
        999 |        788        7.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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