Frequencies for first 10,000 rows of drugid28 variable in nhamcsed2014 dataset :

    Drug ID |
   code for |
 medication |
        #28 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,997       99.97       99.97
     a54655 |          1        0.01       99.98
     d01013 |          1        0.01       99.99
     d01015 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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