Frequencies for first 10,000 rows of cntyrfip variable in natlterr1997 dataset :

  County of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
      00000 |          8        0.08        0.08
      06000 |          1        0.01        0.09
      12000 |          1        0.01        0.10
      13000 |          1        0.01        0.11
      17000 |          1        0.01        0.12
      34000 |          1        0.01        0.13
      36000 |          3        0.03        0.16
      39000 |          1        0.01        0.17
      72021 |        518        5.18        5.35
      72025 |        402        4.02        9.37
      72031 |        418        4.18       13.55
      72097 |        216        2.16       15.71
      72113 |        551        5.51       21.22
      72127 |      1,058       10.58       31.80
      72999 |      6,814       68.14       99.94
      78999 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015