Frequencies for first 10,000 rows of drugid21 variable in nhamcsed2015 dataset 

    Drug ID |
   code for |
 medication |
        #21 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,975       99.75       99.75
     a10834 |          1        0.01       99.76
     a54555 |          1        0.01       99.77
     d00045 |          1        0.01       99.78
     d00049 |          1        0.01       99.79
     d00170 |          1        0.01       99.80
     d00255 |          1        0.01       99.81
     d00273 |          1        0.01       99.82
     d00325 |          1        0.01       99.83
     d00395 |          1        0.01       99.84
     d00425 |          1        0.01       99.85
     d00438 |          1        0.01       99.86
     d00593 |          1        0.01       99.87
     d00787 |          1        0.01       99.88
     d01024 |          1        0.01       99.89
     d03157 |          1        0.01       99.90
     d03431 |          1        0.01       99.91
     d03882 |          1        0.01       99.92
     d04121 |          1        0.01       99.93
     d04220 |          1        0.01       99.94
     d04442 |          1        0.01       99.95
     d04510 |          1        0.01       99.96
     d04749 |          1        0.01       99.97
     d05436 |          2        0.02       99.99
     n08012 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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