Frequencies for first 10,000 rows of citrspop variable in natl2002 dataset :

 Population |
    Size of |
    City of |
  Residence |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         20        0.20        0.20
          3 |      4,146       41.46       41.66
          9 |      5,834       58.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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