Frequencies for first 10,000 rows of prdiag1 variable in namcs2012 dataset :

 Is diagnosis #1 probable, questionable |
                           or rule out? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                   No diagnosis entered |         57        0.57        0.57
Dx is probable, questionable, or ruleou |         33        0.33        0.90
Dx is not probable, questionable, ruleo |      9,910       99.10      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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