Frequencies for urgeo variable in impact2003 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,554       35.96       35.96
     OURBAN |      1,105       25.57       61.52
      RURAL |      1,663       38.48      100.00
------------+-----------------------------------
      Total |      4,322      100.00

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