"Classification of political regimes as democracy and dictatorship. Classification of democracies as parliamentary, semi-presidential (mixed) and presidential. Classification of dictatorships as military, civilian and royal. Coverage: 202 countries, from 1946 or year of independence to 2008."
From Arthur S. Banks, to quantify variables covered in Stateman's Yearbook. Over 200 indicators spanning 200 countries, some dating to 1815. Variables cover trade, conflict, infrastructure, expenditure, more.
Macro time series, micro time series, government finance, and social indicators including ethnic fractionalization, party fractionalization, regime changes, and fixed factors. 1960-99. Easterly and Yu.
"The Inter-parliamentary Union PARLINE database contains information on the structure and working methods of 261 parliamentary chambers in all of the 186 countries where a national legislature exists."
All countries, 1900-present, on various measures of democracy. Measures these democratic qualities: Electoral, Liberal, Participatory, Majoritarian, Consensual, Deliberative, and Egalitarian. Also provides subcomponent measures re. elections, judiciary, etc.