Frequencies for first 10,000 rows of asthmaed variable in namcs2003 dataset :

     asthma |
  education |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,872       98.72       98.72
          1 |        128        1.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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