Frequencies for first 10,000 rows of nebuther variable in nhamcsed2008 dataset :

  nebulizer |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,700       97.00       97.00
        yes |        300        3.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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