Frequencies for first 10,000 rows of prdiag3 variable in namcs2012 dataset :

 Is diagnosis #3 probable, questionable |
                           or rule out? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   No diagnosis entered |      7,064       70.64       70.64
Dx is probable, questionable, or ruleou |         18        0.18       70.82
Dx is not probable, questionable, ruleo |      2,918       29.18      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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