Frequencies for first 10,000 rows of spocther variable in nhamcsopd2007 dataset :

speech/occu |
   pational |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,890       98.90       98.90
        yes |        110        1.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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