Frequencies for first 10,000 rows of comstat8 variable in namcs2008 dataset :

composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |        716        7.16        7.16
  combination drug |         64        0.64        7.80
      undetermined |          2        0.02        7.82
                 . |      9,218       92.18      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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