Frequencies for first 10,000 rows of copd variable in nhamcsopd2008 dataset :

       does |
patient now |
 have: copd |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,673       96.73       96.73
        yes |        327        3.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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