Frequencies for first 10,000 rows of prdiag2 variable in nhamcsopd2003 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
            no |      4,250       42.50       42.50
           yes |         99        0.99       43.49
not applicable |      5,651       56.51      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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