Frequencies for first 10,000 rows of copd variable in namcs2011 dataset :

       Does |
patient now |
 have: COPD |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,507       95.07       95.07
        Yes |        493        4.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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