Frequencies for first 10,000 rows of spocther variable in nhamcsopd2008 dataset :

speech/occu |
   pational |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,920       99.20       99.20
        yes |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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