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

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,693       96.93       96.93
          1 |         31        0.31       97.24
        155 |          3        0.03       97.27
        177 |          3        0.03       97.30
        187 |          4        0.04       97.34
        189 |          2        0.02       97.36
        208 |          1        0.01       97.37
        300 |          1        0.01       97.38
        304 |          6        0.06       97.44
        308 |          1        0.01       97.45
        321 |          6        0.06       97.51
        343 |          1        0.01       97.52
        348 |          2        0.02       97.54
        351 |          3        0.03       97.57
        358 |          1        0.01       97.58
        387 |          1        0.01       97.59
        401 |         12        0.12       97.71
        402 |          8        0.08       97.79
        405 |          1        0.01       97.80
        407 |         39        0.39       98.19
        410 |          7        0.07       98.26
        417 |         83        0.83       99.09
        418 |          1        0.01       99.10
        600 |          1        0.01       99.11
        603 |          7        0.07       99.18
        605 |          1        0.01       99.19
        606 |         13        0.13       99.32
        695 |          7        0.07       99.39
        795 |          1        0.01       99.40
        804 |          1        0.01       99.41
        996 |         40        0.40       99.81
        998 |          1        0.01       99.82
        999 |         18        0.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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