Frequencies for first 10,000 rows of drugid30 variable in namcs2015 dataset :

Drug ID for |
 medication |
        #30 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,996       99.96       99.96
     a54655 |          1        0.01       99.97
     d01018 |          1        0.01       99.98
     d04399 |          1        0.01       99.99
     d04532 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017