Frequencies for first 10,000 rows of citrspop variable in natl1973 dataset :

 Population |
     size - |
   place of |
  residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          2        0.02        0.02
          1 |          3        0.03        0.05
          2 |      1,030       10.30       10.35
          9 |      8,965       89.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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