Frequencies for first 10,000 rows of drug8cl3 variable in namcs2005 dataset :

ndc code #3 |
        for |
 medication |
         #8 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,982       99.82       99.82
       0510 |          2        0.02       99.84
       1728 |         13        0.13       99.97
       1864 |          1        0.01       99.98
       1944 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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