Frequencies for first 10,000 rows of drug8cl3 variable in namcs2004 dataset :

ndc code #3 |
        for |
 medication |
         #8 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,986       99.86       99.86
       1728 |         13        0.13       99.99
       1944 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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