Frequencies for first 10,000 rows of rcity_pop variable in natl2003 dataset :

 Population |
         of |
  Residence |
   City U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |      4,265       42.65       42.65
          3 |          6        0.06       42.71
          9 |      5,729       57.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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