Frequencies for first 10,000 rows of senbefor variable in nhamcsopd2002 dataset :

has patient been seen in |
     this clinic before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
                   Blank |        184        1.84        1.84
Yes, established patient |      8,352       83.52       85.36
         No, new patient |      1,464       14.64      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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