Frequencies for first 10,000 rows of drug4cl3 variable in namcs2003 dataset :

ndc code #3 |
        for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,929       99.29       99.29
       0514 |          2        0.02       99.31
       0915 |          1        0.01       99.32
       1374 |          5        0.05       99.37
       1728 |         55        0.55       99.92
       1864 |          3        0.03       99.95
       1940 |          1        0.01       99.96
       1944 |          3        0.03       99.99
       1945 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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