Frequencies for first 10,000 rows of primcare variable in namcs2006 dataset :

are you the |
  patient's |
    primary |
       care |
 physician? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |        153        1.53        1.53
        yes |      7,260       72.60       74.13
         no |      2,306       23.06       97.19
    unknown |        281        2.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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