Frequencies for first 10,000 rows of drugid12 variable in nhamcsed2012 dataset :

    Drug ID |
   code for |
 medication |
        #12 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,986       99.86       99.86
     a51675 |          1        0.01       99.87
     a55115 |          1        0.01       99.88
     d00051 |          1        0.01       99.89
     d00248 |          1        0.01       99.90
     d00252 |          1        0.01       99.91
     d00438 |          1        0.01       99.92
     d00746 |          1        0.01       99.93
     d00749 |          1        0.01       99.94
     d00910 |          1        0.01       99.95
     d03050 |          1        0.01       99.96
     d03157 |          1        0.01       99.97
     d04258 |          1        0.01       99.98
     d04697 |          1        0.01       99.99
     d05421 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016