Frequencies for urgeo variable in impact2015 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,440       41.43       41.43
     OURBAN |      1,163       33.46       74.88
      RURAL |        873       25.12      100.00
------------+-----------------------------------
      Total |      3,476      100.00

by Jean Roth , jroth@nber.org , 16 Dec 2016