Frequencies for first 10,000 rows of prdiag3 variable in nhamcsed2007 dataset :

      is diag3 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
not applicable |      8,349       83.49       83.49
            no |      1,558       15.58       99.07
           yes |         93        0.93      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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