Frequencies for first 10,000 rows of drg2ing3 variable in nhamcsed1995 dataset :

 ingredient |
code #3 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,894       98.94       98.94
      50637 |          1        0.01       98.95
      50745 |          7        0.07       99.02
      51130 |          1        0.01       99.03
      53175 |          6        0.06       99.09
      53895 |          1        0.01       99.10
      54395 |         28        0.28       99.38
      54465 |         19        0.19       99.57
      54595 |          5        0.05       99.62
      54960 |          4        0.04       99.66
      54990 |          1        0.01       99.67
      54995 |          9        0.09       99.76
      55105 |          3        0.03       99.79
      55145 |          1        0.01       99.80
      55240 |         18        0.18       99.98
      55745 |          1        0.01       99.99
      56020 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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