Frequencies for first 10,000 rows of prdiag2 variable in nhamcsopd2009 dataset :

             for dx2, is this probable, |
              questionable, or ruleout? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   no diagnosis entered |      5,504       55.04       55.04
dx is not probable, questionable, ruleo |      4,424       44.24       99.28
dx is probable, questionable, or ruleou |         72        0.72      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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