Frequencies for first 10,000 rows of prdiag2 variable in namcs2013 dataset :

 Is diagnosis $2 probable, questionable |
                           or rule out? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   No diagnosis entered |      3,980       39.80       39.80
Dx is probable, questionable, or ruleou |         55        0.55       40.35
Dx is not probable, questionable, ruleo |      5,965       59.65      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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