Frequencies for first 10,000 rows of physioth variable in nhamcsopd2002 dataset :

physiothera |
         py |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,763       97.63       97.63
          1 |        237        2.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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