Frequencies for first 10,000 rows of prdiag2 variable in nhamcsed2004 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
            no |      3,943       39.43       39.43
           yes |        236        2.36       41.79
not applicable |      5,821       58.21      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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