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

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |          2        0.02        0.03
          2 |        709        7.09        7.12
          3 |      1,544       15.44       22.56
          9 |      7,744       77.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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