Frequencies for first 10,000 rows of senbefor variable in nhamcsopd1999 dataset :

has patient been seen in |
     this clinic before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      7,968       79.68       79.68
         No, new patient |      1,782       17.82       97.50
                   Blank |        250        2.50      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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