Frequencies for first 10,000 rows of prdiag2 variable in nhamcsed1999 dataset :

   is diag2 |
  probable, |
questionabl |
       e or |
   ruleout? |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,348       33.48       33.48
          1 |        327        3.27       36.75
          2 |      6,325       63.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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