Frequencies for first 10,000 rows of comstat9 variable in namcs2014 dataset :

Composition status |
          code for |
     medication #9 |      Freq.     Percent        Cum.
-------------------+-----------------------------------
Single entity drug |      1,058       10.58       10.58
  Combination drug |        108        1.08       11.66
      Undetermined |         34        0.34       12.00
                 . |      8,800       88.00      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017