Frequencies for first 10,000 rows of prdiag2 variable in nhamcsed2005 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
            no |      4,289       42.89       42.89
           yes |        198        1.98       44.87
not applicable |      5,513       55.13      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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