Frequencies for urgeo variable in impact2001 dataset :

      Large |
     Urban, |
Other Urban |
   or Rural |
Designation |
     of the |
  Providers |
 Geographic |
       CBSA |      Freq.     Percent        Cum.
------------+-----------------------------------
     LURBAN |      1,609       32.29       32.29
     OURBAN |      1,185       23.78       56.07
      RURAL |      2,189       43.93      100.00
------------+-----------------------------------
      Total |      4,983      100.00

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