Aggregate State Legislator Shor-McCarty Ideology Data, January 2025 update

The Shor-McCarty state legislative aggregate ideology data is being released as an update to the data underlying Shor and McCarty (2011). These are based on individual-level ideal point estimates (called “Shor-McCarty NPAT Scores” or “Shor-McCarty Common Space Scores”) described fully in that article. The updated data is described in Shor and McCarty (2022). We ask you to please cite both papers if you use our data.
Estimates are all in NPAT common ideological space to facilitate explicit comparisons
across time and between states. The data stretch from 1993 to 2022, newly incorporating the 2020 and 2021 state legislative elections, and filling in a portion of data missing in previous releases. There are now 2,730 aggregate chamber-year observations, compared with 2,519 in the last release.

Shor-McCarty州立法机构意识形态聚合数据作为Shor和McCarty（2011）基础数据的更新版本发布。该数据基于个体层面的理想点估计值（称为“Shor-McCarty NPAT分数”或“Shor-McCarty共同空间分数”），相关细节在上述文章中有完整描述。更新后的数据在Shor和McCarty（2022）中有所阐述。若您使用本数据，请同时引用这两篇论文。
所有估计值均处于NPAT共同意识形态空间内，以支持跨时间与跨州的明确比较。数据时间跨度为1993年至2022年，新增纳入了2020年和2021年的州立法选举数据，并填补了此前版本中的部分缺失数据。当前版本包含2730个议院年度聚合观测值，而上一版本为2519个。