Frequencies for first 10,000 rows of senbefor variable in nhamcsopd2000 dataset :

has patient been seen in |
     this clinic before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,094       80.94       80.94
         No, new patient |      1,699       16.99       97.93
                   Blank |        207        2.07      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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