Frequencies for first 10,000 rows of citrspop variable in natl1982 dataset :

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |        808        8.08        8.08
          3 |      1,255       12.55       20.63
          9 |      7,937       79.37      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016