Frequencies for first 10,000 rows of edprim variable in nhamcsed2013 dataset :

        When patients with |
   identified primary care |
physicians (PCP) arrive at |
                the ED, ho |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
                     Blank |     10,000      100.00      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016