Frequencies for first 10,000 rows of drug4cl3 variable in namcs2004 dataset :

ndc code #3 |
        for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,932       99.32       99.32
       0506 |          1        0.01       99.33
       0514 |          3        0.03       99.36
       1374 |          3        0.03       99.39
       1567 |          1        0.01       99.40
       1728 |         55        0.55       99.95
       1944 |          2        0.02       99.97
       1945 |          1        0.01       99.98
       2096 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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