opened on: 25 Aug 2014, 02:59:42 _dta: 1. by Jean Roth , jroth@nber.org , 2012-10-05 2. by Jean Roth , jroth@nber.org , 13 Aug 2014 3. Census 2000 SF1 Summary Level 140 4. Unique identifier is county tract 5. Distances between Tract that are within 100 miles > iles.dta obs: 129,563,802 vars: 5 13 Aug 2014 17:08 size: 3,886,914,060 (_dta has notes) ------------------------------------------------------------------------------- storage display value variable name type format label variable label ------------------------------------------------------------------------------- county1 str5 %9s FIPS County 1 tract1 str6 %9s FIPS Tract 1 mi_to_tract double %10.0g Distance between tracts that are within 100 miles county2 str5 %9s FIPS County 2 tract2 str6 %9s FIPS Tract 2 ------------------------------------------------------------------------------- Sorted by: county1 tract1 mi_to_tract county2 tract2