Frequencies for urgeo variable in impact2009 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,444       39.90       39.90
     OURBAN |      1,160       32.05       71.95
      RURAL |      1,015       28.05      100.00
------------+-----------------------------------
      Total |      3,619      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016