Frequencies for first 10,000 rows of cntrspop variable in natl1999 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,512       15.12       15.12
          2 |      1,006       10.06       25.18
          3 |      2,264       22.64       47.82
          9 |      5,218       52.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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