Frequencies for first 10,000 rows of comstat3 variable in nhamcsed1997 dataset :

composition |
status code |
for drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,555       15.55       15.55
          2 |        233        2.33       17.88
          3 |         70        0.70       18.58
          . |      8,142       81.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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