Frequencies for first 10,000 rows of drugid20 variable in nhamcsed2014 dataset :

    Drug ID |
   code for |
 medication |
        #20 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,977       99.77       99.77
     a10245 |          1        0.01       99.78
     a11360 |          1        0.01       99.79
     a53175 |          1        0.01       99.80
     d00070 |          1        0.01       99.81
     d00091 |          1        0.01       99.82
     d00108 |          1        0.01       99.83
     d00143 |          1        0.01       99.84
     d00149 |          1        0.01       99.85
     d00233 |          1        0.01       99.86
     d00241 |          1        0.01       99.87
     d00252 |          2        0.02       99.89
     d00325 |          1        0.01       99.90
     d00699 |          1        0.01       99.91
     d00817 |          1        0.01       99.92
     d01019 |          1        0.01       99.93
     d03165 |          1        0.01       99.94
     d03181 |          1        0.01       99.95
     d03431 |          2        0.02       99.97
     d04514 |          2        0.02       99.99
     d05508 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017