Frequencies for urgeo variable in impact2008 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,442       39.89       39.89
     OURBAN |      1,148       31.76       71.65
      RURAL |      1,025       28.35      100.00
------------+-----------------------------------
      Total |      3,615      100.00

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