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

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |        722        7.22        7.23
          3 |      1,538       15.38       22.61
          9 |      7,739       77.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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