Frequencies for first 10,000 rows of nebuther variable in nhamcsed2007 dataset :

  nebulizer |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,704       97.04       97.04
        yes |        296        2.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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