Frequencies for first 10,000 rows of cntrspop variable in natlterr2002 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        993        9.93        9.93
          3 |      2,146       21.46       31.39
          9 |      6,847       68.47       99.86
          Z |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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