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

 Population |
    Size of |
  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      2,214       22.14       22.14
          3 |      4,455       44.55       66.69
          9 |      3,331       33.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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