Frequencies for first 10,000 rows of rcnty_pop variable in natlterr2009 dataset :

 Population |
         of |
  Residence |
 County U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        735        7.35        7.35
          3 |      4,031       40.31       47.66
          9 |      5,219       52.19       99.85
          Z |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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