Frequencies for first 10,000 rows of hincomer variable in nhamcsed2010 dataset :

    Recoded median household |
income in patient's ZIP code |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                missing data |        619        6.19        6.19
  quartile 1 (below $32,793) |      3,064       30.64       36.83
quartile 2 ($32,794-$40,626) |      2,247       22.47       59.30
quartile 3 ($40,627-$52,387) |      2,434       24.34       83.64
quartile 4 ($52,388 or more) |      1,636       16.36      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016