Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed1996 dataset :

 ingredient |
code #4 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,934       99.34       99.34
      51130 |          1        0.01       99.35
      51340 |          2        0.02       99.37
      54468 |          1        0.01       99.38
      54595 |          1        0.01       99.39
      54713 |         25        0.25       99.64
      55105 |          4        0.04       99.68
      55180 |         19        0.19       99.87
      55320 |          1        0.01       99.88
      55755 |         10        0.10       99.98
      56265 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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