Frequencies for first 10,000 rows of prdiag4 variable in namcs2014 dataset :

 Is diagnosis #4 probable, questionable |
                           or rule out? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   No diagnosis entered |      7,400       74.00       74.00
Dx is probable, questionable, or ruleou |         11        0.11       74.11
Dx is not probable, questionable, ruleo |      2,589       25.89      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017