Frequencies for first 10,000 rows of copd variable in namcs2007 dataset :

       does |
patient now |
 have: copd |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,550       95.50       95.50
        yes |        450        4.50      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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