Frequencies for first 10,000 rows of drug6cl3 variable in namcs2003 dataset :

ndc code #3 |
        for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,963       99.63       99.63
       0877 |          1        0.01       99.64
       0915 |          2        0.02       99.66
       1374 |          1        0.01       99.67
       1728 |         30        0.30       99.97
       1944 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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