Frequencies for first 10,000 rows of drg4ing4 variable in namcs1993 dataset :

 ingredient |
code #4 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,992       99.92       99.92
      51340 |          1        0.01       99.93
      54465 |          1        0.01       99.94
      54468 |          1        0.01       99.95
      54960 |          1        0.01       99.96
      55150 |          1        0.01       99.97
      55770 |          1        0.01       99.98
      56194 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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