Frequencies for first 10,000 rows of nebuther variable in nhamcsed2013 dataset :

  Nebulizer |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,729       97.29       97.29
        Yes |        271        2.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016