Frequencies for first 10,000 rows of mentstat variable in nhamcsed1997 dataset :

     mental |
status exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,940       79.40       79.40
          1 |      2,060       20.60      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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