Frequencies for first 10,000 rows of copd variable in namcs2015 dataset :

       Does |
patient now |
 have: COPD |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,731       97.31       97.31
          1 |        269        2.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017