Frequencies for first 10,000 rows of prdiag1 variable in nhamcsed2009 dataset :

   is diag1 |
  probable, |
questionabl |
      e, or |
   ruleout? |      Freq.     Percent        Cum.
------------+-----------------------------------
         -7 |        114        1.14        1.14
          0 |      9,808       98.08       99.22
          1 |         78        0.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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