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

  DRUG TEST |
    RESULTS |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,101       71.01       71.01
          1 |      1,554       15.54       86.55
          2 |         10        0.10       86.65
          3 |         21        0.21       86.86
          4 |         96        0.96       87.82
          6 |         22        0.22       88.04
          7 |          5        0.05       88.09
          9 |         25        0.25       88.34
         10 |         10        0.10       88.44
         97 |         27        0.27       88.71
         98 |          5        0.05       88.76
         99 |      1,124       11.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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