Frequencies for first 10,000 rows of cntrspop variable in natl1994 dataset :

 Population |
    Size of |
  County of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          2        0.02        0.02
          1 |      1,572       15.72       15.74
          2 |        855        8.55       24.29
          3 |      2,235       22.35       46.64
          9 |      5,334       53.34       99.98
          Z |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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