Frequencies for pmcarr_i1 variable in parkwork dataset :

       mcid |
    issuing |
  authority |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        900       83.03       83.03
          6 |          8        0.74       83.76
          8 |          1        0.09       83.86
         12 |          2        0.18       84.04
         13 |          1        0.09       84.13
         18 |          1        0.09       84.23
         25 |          1        0.09       84.32
         36 |          1        0.09       84.41
         37 |          1        0.09       84.50
         40 |          2        0.18       84.69
         51 |          2        0.18       84.87
         57 |         95        8.76       93.63
         77 |         27        2.49       96.13
         88 |         28        2.58       98.71
         99 |         14        1.29      100.00
------------+-----------------------------------
      Total |      1,084      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016