Frequencies for first 10,000 rows of copd variable in namcs1996 dataset :

       does |
    patient |
have - copd |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,576       95.76       95.76
          1 |        424        4.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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