Frequencies for first 10,000 rows of prdiag2 variable in nhamcsed2008 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
not applicable |      5,527       55.27       55.27
            no |      4,300       43.00       98.27
           yes |        173        1.73      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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