Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed1997 dataset :

 ingredient |
code #4 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,951       99.51       99.51
      52465 |          1        0.01       99.52
      53620 |          1        0.01       99.53
      54595 |          1        0.01       99.54
      54713 |         18        0.18       99.72
      55180 |         17        0.17       99.89
      55755 |          9        0.09       99.98
      56265 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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