Frequencies for first 10,000 rows of citrspop variable in natl1992 dataset :

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |          1        0.01        0.02
          2 |        774        7.74        7.76
          3 |      1,733       17.33       25.09
          9 |      7,490       74.90       99.99
          Z |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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