Frequencies for first 10,000 rows of rcnty_pop variable in natlterr2011 dataset :

 Population |
         of |
  Residence |
 County U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,033       10.33       10.33
          2 |        449        4.49       14.82
          3 |      5,452       54.52       69.34
          9 |      3,056       30.56       99.90
          Z |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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