Frequencies for first 10,000 rows of senbefl variable in namcs2015 dataset :

        Was |
   variable |
   imputed: |
    patient |
    seen in |
   practice |
     before |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,941       99.41       99.41
          1 |         59        0.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017