Frequencies for urgeo variable in impact2004 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,523       36.81       36.81
     OURBAN |      1,080       26.11       62.92
      RURAL |      1,534       37.08      100.00
------------+-----------------------------------
      Total |      4,137      100.00

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