Frequencies for first 10,000 rows of rcnty_pop variable in natlterr2010 dataset :

 Population |
         of |
  Residence |
 County U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,071       10.71       10.71
          2 |        417        4.17       14.88
          3 |      5,536       55.36       70.24
          9 |      2,961       29.61       99.85
          Z |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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