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

Recoded % of population 25 years and |
over w/BA or higher in patient's ZIP |
                                code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                        missing data |        620        6.20        6.20
quartile 1 (less than 12.84 percent) |      2,967       29.67       35.87
    quartile 2 (12.84-19.66 percent) |      2,251       22.51       58.38
    quartile 3 (19.67-31.68 percent) |      2,391       23.91       82.29
  quartile 4 (31.69 percent or more) |      1,771       17.71      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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