Frequencies for first 10,000 rows of senbefor variable in nhamcsopd2010 dataset :

    has the patient been |
     seen in this clinic |
                 before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
yes, established patient |      8,216       82.16       82.16
         no, new patient |      1,784       17.84      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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