HMO enrollment/total population by MSA level
Sum of square hospital market share by county
1 if a major safety net hospital is located within
the region; 0 otherwise
Total population in 1,000 by county
Per capital income in 1,000 by county
Unemployment rate by county
Medicare inpatient days/total inpatient days
Medicaid inpatient days/total inpatient days
1 if hospital is for profit; 0 otherwise
1 if hospital is a member of a multihospital system;
0 otherwise
1 if hospital is in urban area; 0 otherwise
1 if hospital has residency programs or is