Frequencies for first 10,000 rows of cntrspop variable in natl1993 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          2        0.02        0.02
          1 |      1,592       15.92       15.94
          2 |        968        9.68       25.62
          3 |      2,106       21.06       46.68
          9 |      5,332       53.32      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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