Frequencies for first 10,000 rows of mentstat variable in nhamcsed1998 dataset :

     mental |
status exam |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,901       79.01       79.01
          1 |      2,099       20.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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