Frequencies for first 10,000 rows of cntocpop variable in natlterr1995 dataset :

 Population |
    Size of |
  County of |
 Occurrence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      2,178       21.78       21.78
          3 |      4,791       47.91       69.69
          9 |      3,031       30.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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