Frequencies for first 10,000 rows of psychoth variable in nhamcsopd1997 dataset :

psychothera |
         py |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,430       94.30       94.30
          1 |        570        5.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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