Frequencies for first 10,000 rows of senbefor variable in namcs1999 dataset :

      have you/anyone in |
       practice seen pat |
                 before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,218       82.18       82.18
         No, new patient |      1,535       15.35       97.53
                   Blank |        247        2.47      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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