Frequencies for first 10,000 rows of cntocpop variable in natlterr1998 dataset :

 Population |
    Size of |
  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      2,381       23.81       23.81
          3 |      4,482       44.82       68.63
          9 |      3,137       31.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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