Frequencies for first 10,000 rows of comstat6 variable in namcs2006 dataset :

          for rx6, |
composition status |
              code |      Freq.     Percent        Cum.
-------------------+-----------------------------------
single entity drug |      1,109       11.09       11.09
  combination drug |        126        1.26       12.35
                 . |      8,765       87.65      100.00
-------------------+-----------------------------------
             Total |     10,000      100.00

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