Frequencies for first 10,000 rows of comstat2 variable in nhamcsed1999 dataset :

composition |
status code |
for drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,315       33.15       33.15
          2 |        540        5.40       38.55
          3 |        167        1.67       40.22
          . |      5,978       59.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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