Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed1995 dataset :

 ingredient |
code #4 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,943       99.43       99.43
      54468 |          2        0.02       99.45
      54595 |          2        0.02       99.47
      54713 |         20        0.20       99.67
      55180 |         23        0.23       99.90
      55315 |          1        0.01       99.91
      55755 |          5        0.05       99.96
      55770 |          1        0.01       99.97
      55915 |          1        0.01       99.98
      56265 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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