Frequencies for first 10,000 rows of drg2ing3 variable in nhamcsed1992 dataset :

 Ingredient |
code #3 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,908       99.08       99.08
      50637 |          1        0.01       99.09
      50745 |          3        0.03       99.12
      51670 |          1        0.01       99.13
      52955 |          2        0.02       99.15
      53175 |          8        0.08       99.23
      54395 |         17        0.17       99.40
      54465 |         16        0.16       99.56
      54595 |         20        0.20       99.76
      54995 |          4        0.04       99.80
      55240 |         20        0.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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