Frequencies for first 10,000 rows of asthmaed variable in nhamcsopd2004 dataset :

     asthma |
  education |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,858       98.58       98.58
        yes |        142        1.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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