Frequencies for first 10,000 rows of nebuther variable in nhamcsed2009 dataset :

  nebulizer |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,679       96.79       96.79
          1 |        321        3.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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