Frequencies for first 10,000 rows of citrspop variable in natl1991 dataset :

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        910        9.10        9.10
          3 |      1,265       12.65       21.75
          9 |      7,825       78.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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