Frequencies for first 10,000 rows of drug6cl3 variable in namcs2005 dataset :

ndc code #3 |
        for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,939       99.39       99.39
       0514 |          2        0.02       99.41
       1374 |          2        0.02       99.43
       1728 |         50        0.50       99.93
       1944 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016