Frequencies for first 10,000 rows of prdiag2 variable in nhamcsopd2004 dataset :

      is diag2 |
     probable, |
 questionable, |
   or ruleout? |      Freq.     Percent        Cum.
---------------+-----------------------------------
            no |      4,500       45.00       45.00
           yes |        202        2.02       47.02
not applicable |      5,298       52.98      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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