Frequencies for first 10,000 rows of edprim variable in nhamcsed2015 dataset :

        When patients with |
   identified primary care |
physicians (PCP) arrive at |
                the ED, ho |      Freq.     Percent        Cum.
---------------------------+-----------------------------------
                     Blank |         57        0.57        0.57
                   Unknown |        696        6.96        7.53
                    Always |      5,197       51.97       59.50
                 Sometimes |      1,958       19.58       79.08
                    Rarely |        694        6.94       86.02
                     Never |      1,398       13.98      100.00
---------------------------+-----------------------------------
                     Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017