Frequencies for first 10,000 rows of physioth variable in nhamcsopd2003 dataset :

physiothera |
         py |      Freq.     Percent        Cum.
------------+-----------------------------------
         no |      9,815       98.15       98.15
        yes |        185        1.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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