Frequencies for first 10,000 rows of cntrspop variable in natl2000 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,545       15.45       15.45
          2 |      1,035       10.35       25.80
          3 |      2,208       22.08       47.88
          9 |      5,212       52.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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