Frequencies for first 10,000 rows of agi_class variable in zipcode2007 dataset :

  agi_class |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,577       15.77       15.77
          2 |      1,520       15.20       30.97
          3 |      1,553       15.53       46.50
          4 |      1,511       15.11       61.61
          5 |      1,442       14.42       76.03
          6 |      1,398       13.98       90.01
          7 |        999        9.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Jun 2017