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

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,847       98.47       98.47
        136 |          2        0.02       98.49
        155 |          2        0.02       98.51
        177 |          1        0.01       98.52
        187 |          1        0.01       98.53
        304 |          1        0.01       98.54
        334 |          1        0.01       98.55
        351 |          7        0.07       98.62
        358 |          1        0.01       98.63
        367 |          1        0.01       98.64
        401 |          3        0.03       98.67
        407 |          5        0.05       98.72
        410 |         13        0.13       98.85
        417 |         22        0.22       99.07
        423 |          1        0.01       99.08
        513 |          1        0.01       99.09
        515 |          1        0.01       99.10
        519 |          1        0.01       99.11
        600 |          1        0.01       99.12
        603 |          4        0.04       99.16
        605 |          3        0.03       99.19
        606 |         18        0.18       99.37
        695 |          6        0.06       99.43
        702 |          1        0.01       99.44
        996 |         27        0.27       99.71
        999 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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