Frequencies for first 10,000 rows of drg1ing4 variable in namcs1998 dataset :

 ingredient |
code #4 for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,887       98.87       98.87
      51340 |          2        0.02       98.89
      54238 |          1        0.01       98.90
      54455 |          3        0.03       98.93
      54465 |          1        0.01       98.94
      54468 |          6        0.06       99.00
      54595 |          9        0.09       99.09
      54700 |          1        0.01       99.10
      54713 |         13        0.13       99.23
      54995 |          2        0.02       99.25
      55180 |          7        0.07       99.32
      55383 |          1        0.01       99.33
      55435 |          2        0.02       99.35
      55710 |         10        0.10       99.45
      55755 |         40        0.40       99.85
      55770 |          4        0.04       99.89
      56185 |          1        0.01       99.90
      56194 |          3        0.03       99.93
      56265 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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