Frequencies for first 10,000 rows of drugid25 variable in namcs2014 dataset :

Drug ID for |
 medication |
        #25 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,980       99.80       99.80
     c00220 |          1        0.01       99.81
     d00021 |          3        0.03       99.84
     d00044 |          1        0.01       99.85
     d00427 |          1        0.01       99.86
     d00749 |          1        0.01       99.87
     d00797 |          2        0.02       99.89
     d00848 |          1        0.01       99.90
     d03129 |          2        0.02       99.92
     d03428 |          1        0.01       99.93
     d03655 |          1        0.01       99.94
     d03692 |          1        0.01       99.95
     d03826 |          2        0.02       99.97
     d04753 |          1        0.01       99.98
     d05350 |          1        0.01       99.99
     d07660 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017