Frequencies for first 10,000 rows of prdiag2 variable in nhamcsed2007 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
not applicable |      5,564       55.64       55.64
            no |      4,189       41.89       97.53
           yes |        247        2.47      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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