Frequencies for first 10,000 rows of cntyrfip variable in natlterr2001 dataset :

  County of |
  Residence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         11        0.11        0.11
       8000 |          1        0.01        0.12
      12000 |          3        0.03        0.15
      13000 |          1        0.01        0.16
      28000 |          1        0.01        0.17
      34000 |          1        0.01        0.18
      36000 |          1        0.01        0.19
      39000 |          1        0.01        0.20
      72021 |        548        5.48        5.68
      72025 |        386        3.86        9.54
      72031 |        458        4.58       14.12
      72097 |        220        2.20       16.32
      72113 |        536        5.36       21.68
      72127 |        990        9.90       31.58
      72999 |      6,837       68.37       99.95
      78999 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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