The R2=.93: Where then do they Differ? Comparing Liberal and Conservative Interest Group Ratings

Interest groups ratings have long been used by social scientists to distinguish between liberal and conservative members of Congress. It is also well known that ratings by different groups are highly correlated with one another. Here, rather than focusing on the similarities between such measures, we focus on the differences between them. Although the relationship between measures is nearly linear, we find systematic robust differences between ADA and ACU scores.