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

  Occurence |
     County |
 Population |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |      5,428       54.28       54.30
          3 |          5        0.05       54.35
          9 |      4,565       45.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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