District ID (1-300)
Country ID (1-8)
Calendar year (2003-2012)
Treatment group (0=none,1=low,2=med,3=high price)
Mining district (binary)
Mineral price index
Constraints on the executive (1-6)
Quality of government (0.22-0.70)
GDP per capita
Elevation (meters)
Mean temperature (Celsius)
Terrain ruggedness
Distance to capital (meters)
Agricultural suitability (0-1)
Population
Ethnic fractionalization (0-1)
Log nighttime lights
Conflict event (binary)