Frequencies for first 10,000 rows of primcare variable in nhamcsopd2004 dataset :

are you the |
  patient's |
    primary |
       care |
 physician? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |         69        0.69        0.69
        yes |      2,827       28.27       28.96
         no |      6,764       67.64       96.60
    unknown |        340        3.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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