Frequencies for first 10,000 rows of drug3cl3 variable in namcs2003 dataset :

ndc code #3 |
        for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,902       99.02       99.02
       0514 |          5        0.05       99.07
       1374 |          3        0.03       99.10
       1568 |          1        0.01       99.11
       1670 |          2        0.02       99.13
       1727 |          1        0.01       99.14
       1728 |         76        0.76       99.90
       1944 |          7        0.07       99.97
       1945 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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