Institutional Variance Dataset

A dataset of variations across governmental institutions and democracy. Combines multiple data sources to provide annual classifications along three dimension:

1. type of electoral system, 
   
2. type of executive system and
3. type of federal system. 
   

In addition to the codebook, more information on the sources and how the dataset was constructed is available from the PhD thesis "Institutional Variance of the Democratic Peace, 1816-2002", by Anita Schjølset.