Frequencies for first 10,000 rows of copd variable in nhamcsopd2011 dataset :

       Does |
patient now |
have - COPD |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,705       97.05       97.05
        Yes |        295        2.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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