Frequencies for first 10,000 rows of drugid20 variable in nhamcsed2015 dataset 

    Drug ID |
   code for |
 medication |
        #20 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,971       99.71       99.71
     a51675 |          1        0.01       99.72
     d00011 |          1        0.01       99.73
     d00019 |          1        0.01       99.74
     d00022 |          2        0.02       99.76
     d00032 |          1        0.01       99.77
     d00049 |          1        0.01       99.78
     d00125 |          2        0.02       99.80
     d00132 |          1        0.01       99.81
     d00207 |          1        0.01       99.82
     d00246 |          1        0.01       99.83
     d00252 |          1        0.01       99.84
     d00265 |          1        0.01       99.85
     d00269 |          1        0.01       99.86
     d00308 |          1        0.01       99.87
     d00355 |          1        0.01       99.88
     d00438 |          1        0.01       99.89
     d00468 |          1        0.01       99.90
     d00880 |          1        0.01       99.91
     d01013 |          1        0.01       99.92
     d03752 |          1        0.01       99.93
     d03796 |          1        0.01       99.94
     d04113 |          1        0.01       99.95
     d04284 |          1        0.01       99.96
     d04505 |          1        0.01       99.97
     d04514 |          1        0.01       99.98
     d05350 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017