Frequencies for first 10,000 rows of prdiag2 variable in nhamcsopd2008 dataset :

             for dx2, is this probable, |
              questionable, or ruleout? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   no diagnosis entered |      4,912       49.12       49.12
dx is not probable, questionable, ruleo |      4,976       49.76       98.88
dx is probable, questionable, or ruleou |        112        1.12      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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