Frequencies for first 10,000 rows of drg4ing4 variable in namcs2004 dataset :

 ingredient |
code #4 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,987       99.87       99.87
      55490 |          1        0.01       99.88
      55755 |          4        0.04       99.92
      57210 |          1        0.01       99.93
      70260 |          3        0.03       99.96
      70439 |          1        0.01       99.97
      70668 |          1        0.01       99.98
      70691 |          1        0.01       99.99
      70753 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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