Frequencies for first 10,000 rows of drugid26 variable in nhamcsed2014 dataset :

    Drug ID |
   code for |
 medication |
        #26 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,992       99.92       99.92
     d00134 |          1        0.01       99.93
     d00246 |          1        0.01       99.94
     d00255 |          1        0.01       99.95
     d00262 |          1        0.01       99.96
     d00316 |          1        0.01       99.97
     d00321 |          1        0.01       99.98
     d00749 |          1        0.01       99.99
     d03041 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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