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

  DRUG TEST |
    RESULTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,611       76.11       76.11
          1 |      1,434       14.34       90.45
          2 |         11        0.11       90.56
          3 |         27        0.27       90.83
          4 |        105        1.05       91.88
          6 |         46        0.46       92.34
          7 |          5        0.05       92.39
          9 |         18        0.18       92.57
         10 |         14        0.14       92.71
         97 |         15        0.15       92.86
         98 |          5        0.05       92.91
         99 |        709        7.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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