Frequencies for first 10,000 rows of drugid22 variable in nhamcsed2015 dataset 

    Drug ID |
   code for |
 medication |
        #22 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,978       99.78       99.78
     d00045 |          1        0.01       99.79
     d00049 |          1        0.01       99.80
     d00134 |          1        0.01       99.81
     d00252 |          1        0.01       99.82
     d00262 |          1        0.01       99.83
     d00278 |          1        0.01       99.84
     d00310 |          1        0.01       99.85
     d00329 |          1        0.01       99.86
     d00350 |          1        0.01       99.87
     d00370 |          1        0.01       99.88
     d00497 |          1        0.01       99.89
     d00749 |          1        0.01       99.90
     d00867 |          2        0.02       99.92
     d01015 |          1        0.01       99.93
     d02376 |          1        0.01       99.94
     d03160 |          1        0.01       99.95
     d04160 |          1        0.01       99.96
     d04220 |          1        0.01       99.97
     d04755 |          1        0.01       99.98
     d04829 |          1        0.01       99.99
     d05350 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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