Frequencies for first 10,000 rows of senbefor variable in nhamcsopd2011 dataset :

Has patient been seen in |
     this clinic before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,242       82.42       82.42
         No, new patient |      1,758       17.58      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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