Frequencies for first 10,000 rows of cntrspop variable in natl1998 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,510       15.10       15.10
          2 |      1,090       10.90       26.00
          3 |      2,178       21.78       47.78
          9 |      5,222       52.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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