Frequencies for first 10,000 rows of pt variable in namcs2014 dataset :

   Physical |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,797       97.97       97.97
        Yes |        203        2.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017