Frequencies for first 10,000 rows of drug4cl3 variable in namcs2005 dataset :

ndc code #3 |
        for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,889       98.89       98.89
       0512 |          1        0.01       98.90
       0514 |          9        0.09       98.99
       0877 |          1        0.01       99.00
       1374 |          7        0.07       99.07
       1670 |          1        0.01       99.08
       1728 |         81        0.81       99.89
       1864 |          2        0.02       99.91
       1943 |          2        0.02       99.93
       1944 |          6        0.06       99.99
       1945 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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