OER are materials that are freely available to everyone including textbooks, ebooks, videos, journals, images, etc. These sources are not searchable in the Ikeda Library catalog so you have to search them independently.
"RAI measures the authority exercised by regional governments within states. The unit of analysis is the individual region and scoring is annual. The dataset comes in five formats: RAI-MLG (each region or regional tier); RAI-Region (most authoritative regional tier in a country); RAI-Country (aggregated to the country); RAI-Indigenous (indigenous communities); RAI-Metro (metropolitan regions)."
"The Regional Authority Index (RAI) is a measure of the authority of regional governments in 81 democracies or quasi-democracies on an annual basis over the period 1950-2010. The dataset encompasses subnational government levels with an average population of 150,000 or more."
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"Varieties of Democracy (V-Dem) is a new approach to conceptualizing and measuring democracy. We provide a multidimensional and disaggregated dataset that reflects the complexity of the concept of democracy as a system of rule that goes beyond the simple presence of elections. The V-Dem project distinguishes between five high-level principles of democracy: electoral, liberal, participatory, deliberative, and egalitarian, and collects data to measure these principles."