Frequencies for urgeo variable in impact2012 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,407       40.19       40.19
     OURBAN |      1,141       32.59       72.78
      RURAL |        953       27.22      100.00
------------+-----------------------------------
      Total |      3,501      100.00

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