Frequencies for first 10,000 rows of mental variable in nhamcsopd1995 dataset :

     mental |
     status |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,755       97.55       97.55
          1 |        245        2.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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