Frequencies for first 10,000 rows of comstat3 variable in nhamcsed1999 dataset :

composition |
status code |
for drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,625       16.25       16.25
          2 |        292        2.92       19.17
          3 |        120        1.20       20.37
          . |      7,963       79.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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