Frequencies for first 10,000 rows of rcnty_pop variable in natlterr2007 dataset :

 Population |
         of |
  Residence |
 County U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        379        3.79        3.79
          3 |      6,977       69.77       73.56
          9 |      2,627       26.27       99.83
          Z |         17        0.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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