Frequencies for first 10,000 rows of senbefor variable in nhamcsopd1998 dataset :

has patient been seen in |
     this clinic before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,154       81.54       81.54
         No, new patient |      1,686       16.86       98.40
                   Blank |        160        1.60      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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