Aggregate Data

Updated Data (v4.0), Released June 2015

• Years: 1993-2014
• 1,816 chamber years of data
• More holes in previous data filled (especially in 2009-2011)
• More improvement in data reliability

Updated Data (v3.0), Released July 2014

• Years: 1993-2013
• 1,695 chamber years of data
• Big holes in previous data filled (especially in 2009-2011)
• Significant improvement in data reliability

Updated Data (v2.0), Released May 2013

• Years: 1993-2011
• 1,353 chamber years of data
• Nebraska party data enabled thanks to Seth Masket
• Data is considerably cleaner and less noisy

APSR Article Data (v1.0) Released January 2012 

• Years: 1993-2011
• 1,213 chamber years of data
• Replication data for APSR article

Individual Level Data

Updated Data, Released June 2015

• Years: 1993-2014
• Observations: 20,783 state legislators

Updated Data, Released July 2014

• Years: 1993-2013
• Observations: 20,198 state legislators

Updated Data, Released May 2013

• Years: 1993-2011
• Observations: 18,189 state legislators