Frequencies for first 10,000 rows of drug3cl3 variable in namcs2005 dataset :

ndc code #3 |
        for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,850       98.50       98.50
       0510 |          1        0.01       98.51
       0512 |          1        0.01       98.52
       0514 |         16        0.16       98.68
       0877 |          1        0.01       98.69
       1374 |         12        0.12       98.81
       1568 |          1        0.01       98.82
       1670 |          1        0.01       98.83
       1728 |         97        0.97       99.80
       1944 |         18        0.18       99.98
       1945 |          1        0.01       99.99
       2096 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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