Frequencies for first 10,000 rows of comstat2 variable in nhamcsed1998 dataset :

composition |
status code |
for drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      3,180       31.80       31.80
          2 |        486        4.86       36.66
          3 |        104        1.04       37.70
          . |      6,230       62.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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