Frequencies for first 10,000 rows of pbamorer variable in nhamcsed2006 dataset :

  percent pop w/bachelor's degree or |
        higher in patient's zip code |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
quartile 1 (less than 12.84 percent) |      2,549       25.49       25.49
    quartile 2 (12.84-19.66 percent) |      2,591       25.91       51.40
    quartile 3 (19.67-31.68 percent) |      2,295       22.95       74.35
  quartile 4 (31.69 percent or more) |      2,105       21.05       95.40
                        missing data |        460        4.60      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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