Frequencies for first 10,000 rows of asthmaed variable in nhamcsopd2005 dataset :

     asthma |
  education |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,830       98.30       98.30
        yes |        170        1.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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