Frequencies for first 10,000 rows of primcare variable in nhamcsopd2003 dataset :

are you the |
  patient's |
    primary |
       care |
 physician? |      Freq.     Percent        Cum.
------------+-----------------------------------
      blank |         85        0.85        0.85
        yes |      3,168       31.68       32.53
         no |      6,158       61.58       94.11
    unknown |        589        5.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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