Frequencies for first 10,000 rows of primcare variable in nhamcsopd2006 dataset :

    are you |
  patient's |
    primary |
       care |
 physician? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        176        1.76        1.76
        Yes |      2,803       28.03       29.79
         No |      6,801       68.01       97.80
    Unknown |        220        2.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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