Frequencies for first 10,000 rows of asthmaed variable in nhamcsopd2007 dataset :

     asthma |
  education |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,902       99.02       99.02
        yes |         98        0.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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