Frequencies for first 10,000 rows of pbamorer variable in namcs2011 dataset :

  Recoded % of pop 25 years and over |
w/BA or higher in patient's ZIP code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                        Missing data |        649        6.49        6.49
Quartile 1 (Less than 12.84 percent) |      2,159       21.59       28.08
    Quartile 2 (12.84-19.66 percent) |      2,499       24.99       53.07
    Quartile 3 (19.67-31.68 percent) |      2,372       23.72       76.79
  Quartile 4 (31.69 percent or more) |      2,321       23.21      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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