Frequencies for first 10,000 rows of cntocfip variable in natl1992 dataset :

  County of |
 Occurrence |
     (FIPS) |      Freq.     Percent        Cum.
------------+-----------------------------------
      01015 |        237        2.37        2.37
      01055 |        243        2.43        4.80
      01073 |      2,530       25.30       30.10
      01089 |        848        8.48       38.58
      01097 |      1,376       13.76       52.34
      01101 |      1,021       10.21       62.55
      01125 |        405        4.05       66.60
      01999 |      3,340       33.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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