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

  DRUG TEST |
  RESULTS-2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,734       97.34       97.34
          1 |         75        0.75       98.09
        128 |          2        0.02       98.11
        155 |          1        0.01       98.12
        167 |          2        0.02       98.14
        177 |          7        0.07       98.21
        187 |          4        0.04       98.25
        188 |          1        0.01       98.26
        208 |          1        0.01       98.27
        304 |          1        0.01       98.28
        321 |          5        0.05       98.33
        338 |          1        0.01       98.34
        343 |          1        0.01       98.35
        348 |          3        0.03       98.38
        351 |          6        0.06       98.44
        355 |          2        0.02       98.46
        376 |          1        0.01       98.47
        401 |          8        0.08       98.55
        402 |          6        0.06       98.61
        407 |         32        0.32       98.93
        410 |          6        0.06       98.99
        417 |         43        0.43       99.42
        422 |          1        0.01       99.43
        423 |          1        0.01       99.44
        515 |          2        0.02       99.46
        600 |          2        0.02       99.48
        603 |          3        0.03       99.51
        606 |          4        0.04       99.55
        695 |          6        0.06       99.61
        702 |          1        0.01       99.62
        817 |          1        0.01       99.63
        901 |          1        0.01       99.64
        996 |         35        0.35       99.99
        999 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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