Frequencies for first 10,000 rows of physioth variable in namcs1998 dataset :

physiothera |
         py |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,666       96.66       96.66
          1 |        334        3.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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