Frequencies for first 10,000 rows of primcare variable in namcs2011 dataset :

    Are you |
  patient’s |
    primary |
       care |
 physician? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        129        1.29        1.29
    Unknown |        441        4.41        5.70
        Yes |      7,028       70.28       75.98
         No |      2,402       24.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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