Frequencies for first 10,000 rows of nebuther variable in nhamcsed2011 dataset :

  Nebulizer |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,667       96.67       96.67
        Yes |        333        3.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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