Frequencies for first 10,000 rows of asthma variable in namcs1993 dataset :

       does |
    patient |
     have - |
     asthma |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,479       94.79       94.79
          1 |        521        5.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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