Frequencies for first 10,000 rows of cntocpop variable in natlterr1999 dataset :

 Population |
    Size of |
  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      2,328       23.28       23.28
          3 |      4,483       44.83       68.11
          9 |      3,189       31.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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