Polity IV contains coded annual information on regime and authority characteristics for all independent states (with greater than 500,000 total population) in the global state system and covers the years 1800-2002.
The International Data Base (IDB) is a computerized source of demographic and socio-economic statistics for 227 countries and areas of the world. The IDB was created in the Census Bureau's International Programs Center and it provides quick access to specialized information, with emphasis on demographic measures, for individual countries or selected groups of countries.
The Penn World Table provides purchasing power parity and national income accounts converted to international prices for 168 countries for some or all of the years 1950-2000. The European Union or the OECD provide more detailed purchasing power and real product estimates for their countries and the World Bank makes current price estimates for most PWT countries at the GDP level.
The dataset is used for William Easterly "The Lost Decades: Developing Countries’ Stagnation in Spite of Policy Reform 1980-1998", Journal of Economic Growth 6, no.2 (2001): 135-157.
The dataset contains 4 parts, each is available in excel and zip format.
1) Macro Time Series
2) Micro Time Series
3) Government Finance
4) Social Indicators and Fixed Factors
The database of Fiscal Decentralization Indicators is derived from IMF's Government Finance Statistics (GFS). Included are the types of indicators included as well as some guidance on how to use and how not to use the indicators as well as where to find the information.
The UNU/WIDER - UNDP World Income Inequality Database (WIID) collects and stores information on income inequality for developed, developing, and transition countries in an easily retrievable, exportable, and analyzable format. It is available on the internet for browsing and download in order to facilitate further analysis and debate on inequality.
Economic Growth Research
A New Data Set Measuring Income Inequality
Data Set Description: This file contains data on Gini coefficients, cumulative quintile shares, explanations regarding the basis on which the Gini coefficient was computed, and the source of the information. There are two data-sets, one containing the "high quality" sample and the other one including all the information (of lower quality) that had been collected.