Frequencies for first 10,000 rows of senbefor variable in namcs2000 dataset :

      have you/anyone in |
       practice seen pat |
                 before? |      Freq.     Percent        Cum.
-------------------------+-----------------------------------
Yes, established patient |      8,776       87.76       87.76
         No, new patient |      1,016       10.16       97.92
                   Blank |        208        2.08      100.00
-------------------------+-----------------------------------
                   Total |     10,000      100.00

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