Frequencies for first 10,000 rows of senbefor variable in namcs1997 dataset :

      have you/anyone in |
       practice seen pat |
                 before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,751       87.51       87.51
         No, new patient |      1,120       11.20       98.71
                   Blank |        129        1.29      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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