Frequencies for pmcarr_i1 variable in parkwork dataset :

       MCID |
    Issuing |
  Authority |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        831       82.93       82.93
          5 |          1        0.10       83.03
          6 |         11        1.10       84.13
         12 |          2        0.20       84.33
         15 |          1        0.10       84.43
         27 |          1        0.10       84.53
         57 |         93        9.28       93.81
         77 |         16        1.60       95.41
         88 |         34        3.39       98.80
         99 |         12        1.20      100.00
------------+-----------------------------------
      Total |      1,002      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016