Frequencies for first 10,000 rows of agi_stub variable in zipcode2015 dataset :

 Size of adjusted gross |
                 income |      Freq.     Percent        Cum.
------------------------+-----------------------------------
       $1 under $25,000 |      1,667       16.67       16.67
  $25,000 under $50,000 |      1,667       16.67       33.34
  $50,000 under $75,000 |      1,667       16.67       50.01
 $75,000 under $100,000 |      1,667       16.67       66.68
$100,000 under $200,000 |      1,666       16.66       83.34
       $200,000 or more |      1,666       16.66      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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