Frequencies for first 10,000 rows of pbamorer variable in namcs2007 dataset :

  percent pop w/bachelor's degree or |
             higher in patient's zip |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                        missing data |        645        6.45        6.45
quartile 1 (less than 12.84 percent) |      2,055       20.55       27.00
    quartile 2 (12.84-19.66 percent) |      2,144       21.44       48.44
    quartile 3 (19.67-31.68 percent) |      2,492       24.92       73.36
  quartile 4 (31.69 percent or more) |      2,664       26.64      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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