Frequencies for first 10,000 rows of drug2cl3 variable in namcs2004 dataset :

ndc code #3 |
        for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,866       98.66       98.66
       0514 |          8        0.08       98.74
       0877 |          4        0.04       98.78
       1264 |          1        0.01       98.79
       1275 |          1        0.01       98.80
       1374 |          9        0.09       98.89
       1479 |          1        0.01       98.90
       1568 |          3        0.03       98.93
       1670 |          2        0.02       98.95
       1728 |         72        0.72       99.67
       1940 |          1        0.01       99.68
       1944 |         26        0.26       99.94
       1945 |          5        0.05       99.99
       2096 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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