Frequencies for first 10,000 rows of drug8cl2 variable in namcs2004 dataset :

ndc code #2 |
        for |
 medication |
         #8 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,964       99.64       99.64
       0120 |          1        0.01       99.65
       0507 |          5        0.05       99.70
       0508 |          1        0.01       99.71
       0512 |          1        0.01       99.72
       0513 |          4        0.04       99.76
       0630 |          1        0.01       99.77
       0913 |          1        0.01       99.78
       1671 |          1        0.01       99.79
       1722 |          1        0.01       99.80
       1724 |         13        0.13       99.93
       1727 |          3        0.03       99.96
       1728 |          1        0.01       99.97
       1943 |          1        0.01       99.98
       1947 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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