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

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      1,079       10.79       10.79
          3 |      2,125       21.25       32.04
          9 |      6,787       67.87       99.91
          Z |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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