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

  County of |
 Occurrence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
      72021 |      1,353       13.53       13.53
      72025 |        770        7.70       21.23
      72031 |        329        3.29       24.52
      72097 |        791        7.91       32.43
      72113 |      1,212       12.12       44.55
      72127 |      2,214       22.14       66.69
      72999 |      3,331       33.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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