The PPI Projects Database uses a number of variables to characterize a country. Some of these variables classify countries in terms of location, income per capita, and IDA status. Other variables measure supply of
The PPI Projects database uses a number of World Bank Group indicators to characterize each country's economy -- the location, income per capita, IDA status and supply of infrastructure services.
- Region: The PPI database uses the World Bank regional groupings
- Gross National Income (GNI) per capita: This indicator is calculated using the Atlas method (current US$). GNI per capita data is from 2010: World Development Indicators published in July 2012.
- Income group: The World Bank income categories are used as published in July 2012.
- IDA status: International Development Association Members: Countries which are eligible for IDA lending (long-term loans at zero interest) on the basis of low per-capita income and lack of creditworthiness to borrow on market terms. Some "blend borrower" countries eligible for IDA loans because of their low per person incomes but are also eligible for IBRD loans because they are financially creditworthy. Eighty-one countries are currently eligible to borrow from IDA. The PPI database uses county IDA status as published in July 2012.
- Electric power consumption (kwh per capita): Electric power consumption measures the production of power plants and combined heat and power plants, less distribution losses, and own use by heat and power plants. The PPI database reports statistics as published in the World Development Indicators.
- Improved water source (% of population with access): Access to an improved water source refers to the percentage of the population with reasonable access to an adequate amount of water from an improved source, such as a household connection, public standpipe, borehole, protected well or spring, and rainwater collection. Unimproved sources include vendors, tanker trucks, and unprotected wells and springs. Reasonable access is defined as the availability of at least 20 liters a person a day from a source within one kilometer of the dwelling. The PPI database reports statistics as published in the World Development Indicators.
- Improved sanitation facilities (% of population with access): Access to improved sanitation facilities refers to the percentage of the population with at least adequate excreta disposal facilities (private or shared, but not public) that can effectively prevent human, animal, and insect contact with excreta. Improved facilities range from simple but protected pit latrines to flush toilets with a sewerage connection. The PPI database reports statistics as published in the World Development Indicators.
- Telephone subscribers per 100 inhabitants: Fixed telephone subscribers divided by population multiplied by 100. The PPI Database reports statistics as reported by the World Bank.
- Mobile cellular subscriptions per 100 inhabitants: The PPI Database reports statistics as reported by the World Bank