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

  DRUG TEST |
  RESULTS-3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,874       98.74       98.74
          1 |          5        0.05       98.79
        155 |          2        0.02       98.81
        165 |          2        0.02       98.83
        167 |          3        0.03       98.86
        177 |          1        0.01       98.87
        187 |          4        0.04       98.91
        189 |          1        0.01       98.92
        208 |          1        0.01       98.93
        304 |          2        0.02       98.95
        321 |          2        0.02       98.97
        337 |          1        0.01       98.98
        351 |          8        0.08       99.06
        358 |          1        0.01       99.07
        367 |          2        0.02       99.09
        401 |          5        0.05       99.14
        402 |          1        0.01       99.15
        407 |          5        0.05       99.20
        410 |         17        0.17       99.37
        417 |          7        0.07       99.44
        513 |          1        0.01       99.45
        600 |          1        0.01       99.46
        601 |          1        0.01       99.47
        603 |          3        0.03       99.50
        606 |          5        0.05       99.55
        695 |          4        0.04       99.59
        996 |         41        0.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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