Frequencies for first 10,000 rows of copd variable in nhamcsopd2006 dataset :

       does |
patient now |
have - copd |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,743       97.43       97.43
        Yes |        257        2.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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