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

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      1,089       10.89       10.89
          3 |      2,218       22.18       33.07
          9 |      6,687       66.87       99.94
          Z |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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