Originally posted by Martlet
What evidence are you referring to?
In particular I'm referring to data collected by Segal and Spaeth, though they have more than one distinct dataset. Others such as Lee Epstein have also collected data coinciding with attitudinal models of judicial behavior. I'm trying to see if I can find URL links to the data itself or at least a summarization of its contents.
Here's a
link to a codebook for a dataset applying Segal and Spaeth's standards for free expression/first amendment cases. I can't find their massive dataset of Supreme Court decisions going back to the Vinson court, but it's out there somewhere, and I'm pretty sure they make it publically available.
It's important to note that liberal and conservative judicial activists tend to be activist on different types of issues. Conservatives, particularly in the Rehnquist court, focus on economic and states rights issues while liberal activists tend to favor civil liberties issues. Also, the Segal and Spaeth dataset does not come free from problems. Most notably, they form ideological distributions based on how justices voted over a number of years on cases that may divide along liberal or conservative outcomes. This is the same methodology employed by Poole and Rosenthal for their W-NOMINATE AND D-NOMINATE congressional ideology scores, but such methodology fails to account for strategic or non-ideological reasons for voting a particular way. Nonetheless, we have no evidence that conservatives or liberals alone engage in exclusively strategic behavior.
I believe Isaac Unah here at UNC works on state and lower federal courts rather than just the Supreme Court. When I was working with him, he was examining ideological behavior in international courts of trade.
-- Todd/Leviathn