Frequencies for first 10,000 rows of drug7cl3 variable in namcs2003 dataset :

ndc code #3 |
        for |
 medication |
         #7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,977       99.77       99.77
       0915 |          1        0.01       99.78
       1374 |          2        0.02       99.80
       1728 |         18        0.18       99.98
       1944 |          1        0.01       99.99
       1945 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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