Frequencies for urgeo variable in impact2013 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,409       40.26       40.26
     OURBAN |      1,137       32.49       72.74
      RURAL |        954       27.26      100.00
------------+-----------------------------------
      Total |      3,500      100.00

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