Frequencies for first 10,000 rows of comstat6 variable in namcs2007 dataset :

composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |      1,147       11.47       11.47
  combination drug |        141        1.41       12.88
                 . |      8,712       87.12      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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