Aggregate State Legislator Shor-McCarty Ideology Data, January 2025 update (doi:10.7910/DVN/T53FFK)

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Part 1: Document Description
Part 2: Study Description
Part 3: Data Files Description
Part 4: Variable Description
Part 5: Other Study-Related Materials
Entire Codebook

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

doi:10.7910/DVN/T53FFK

Harvard Dataverse

2025-01-31

1

Shor, Boris, 2025, "Aggregate State Legislator Shor-McCarty Ideology Data, January 2025 update", https://doi.org/10.7910/DVN/T53FFK, Harvard Dataverse, V1, UNF:6:lfw6DrzG9tscoduSYR6fVw== [fileUNF]

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

doi:10.7910/DVN/T53FFK

Shor, Boris (University of Houston)

Harvard Dataverse

Shor, Boris

Shor, Boris

2025-01-31

https://doi.org/10.7910/DVN/T53FFK

Social Sciences

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, Boris and Nolan McCarty. 2011. "The Ideological Mapping of American Legislatures." American Political Science Review 105(3):530-551

https://doi.org/10.1017/s0003055411000153

Shor, Boris and Nolan McCarty. 2011. "The Ideological Mapping of American Legislatures." American Political Science Review 105(3):530-551

Shor, Boris and Nolan McCarty. 2022. “Two Decades of Polarization in American State Legislatures.” Journal of Political Institutions and Political Economy 3(3-4):343–370

http://dx.doi.org/10.1561/113.00000063

Shor, Boris and Nolan McCarty. 2022. “Two Decades of Polarization in American State Legislatures.” Journal of Political Institutions and Political Economy 3(3-4):343–370

• Number of cases: 1500

• No. of variables per record: 37

• Type of File: text/tab-separated-values

UNF:6:lfw6DrzG9tscoduSYR6fVw==

• st - State
• alpha - State alpha code
• fips - State FIPS code
• icpsr - State ICPSR code
• year
• hou_chamber - House Ideology
• sen_chamber - Senate Ideology
• hou_dem - Ideology: House Democrats
• hou_rep - Ideology: House Republicans
• hou_majority - House Majority Ideology
• hou_minority
• hou_dem_mean - Ideology (Mean): House Democrats
• hou_rep_mean - Ideology (Mean): House Republicans
• sen_dem - Ideology: Senate Democrats
• sen_rep - Ideology: Senate Republicans
• sen_majority - Senate Majority Ideology
• sen_minority
• sen_dem_mean - Ideology (Mean): Senate Democrats
• sen_rep_mean - Ideology (Mean): Senate Republicans
• h_diffs - House Difference in Party Medians
• s_diffs - Senate Difference in Party Medians
• h_distance - Average Distance between House members
• s_distance - Average Distance between House members
• h_dem_sd - Party Heterogeneity House Dems
• s_dem_sd - Party Heterogeneity Senate Dems
• h_rep_sd - Party Heterogeneity House Reps
• s_rep_sd - Party Heterogeneity Senate Reps
• h_chamber_sd - House Chamber Heterogeneity
• s_chamber_sd - Senate Chamber Heterogeneity
• hou_dem_error
• hou_chamber_error
• hou_rep_error
• hou_majority_error
• sen_dem_error
• sen_chamber_error
• sen_rep_error
• sen_majority_error

f10853749 Location:

Variable Format: character

Notes: UNF:6:Y6urPtOxob8NofEgLu/5mA==

f10853749 Location:

Summary Statistics: StDev 14.435682386040286; Min. 1.0; Max. 50.0; Valid 1500.0; Mean 25.5

Variable Format: numeric

Notes: UNF:6:ilLQJPbl6zwdBRg9itMp3Q==

f10853749 Location:

Summary Statistics: StDev 15.62883361910055; Mean 29.32000000000021; Max. 56.0; Min. 1.0; Valid 1500.0

Variable Format: numeric

Notes: UNF:6:u3EWHK51Do8dGZrvWkMbWg==

f10853749 Location:

Summary Statistics: Mean 40.60000000000006; Max. 82.0; Valid 1500.0; StDev 22.498387756335482; Min. 1.0;

Variable Format: numeric

Notes: UNF:6:j674yAJu7K0Q3LhmEyzuQA==

f10853749 Location:

Summary Statistics: Valid 1500.0; StDev 8.658328038924129; Min. 1993.0; Mean 2007.5; Max. 2022.0

Variable Format: numeric

Notes: UNF:6:X3mtz01pSI8Sk5WtgdgS5w==

f10853749 Location:

Summary Statistics: Valid 1359.0; Mean 0.045320824135393685; StDev 0.6673291401082465; Min. -1.426; Max. 1.221

Variable Format: numeric

Notes: UNF:6:eHnKL+8xs0iuBcrzE8Td8g==

f10853749 Location:

Summary Statistics: StDev 0.647056047010676; Min. -1.435; Mean 0.07305178701677613; Valid 1371.0; Max. 1.2

Variable Format: numeric

Notes: UNF:6:kKmRMWEXVYZ8rXtx4cYl8Q==

f10853749 Location:

Summary Statistics: Mean -0.8181434878587197; StDev 0.38248610534300814; Valid 1359.0; Max. 0.087; Min. -1.845

Variable Format: numeric

Notes: UNF:6:uMjMSQP6Z1Z5ctgtnnCWIQ==

f10853749 Location:

Summary Statistics: StDev 0.34520639578851176; Min. -0.267; Max. 1.554; Valid 1359.0; Mean 0.704402501839588;

Variable Format: numeric

Notes: UNF:6:xNSzyIxEMHutQbWcwAfArA==

f10853749 Location:

Summary Statistics: Valid 1359.0; Min. -1.845; StDev 0.8979406864119797; Max. 1.47; Mean 0.01734437086092718

Variable Format: numeric

Notes: UNF:6:ZZUcEGF7RQz6ZhBJ+zyfzQ==

f10853749 Location:

Summary Statistics: StDev 0.7797874432346059; Max. 1.554; Min. -1.666; Mean -0.1310853568800588; Valid 1359.0;

Variable Format: numeric

Notes: UNF:6:jPgGoAAhLQDW1KC0fFGF4Q==

f10853749 Location:

Summary Statistics: Min. -1.9054339559838034; StDev 0.37042615503279575; Valid 1359.0; Max. 0.07336209122086114; Mean -0.8105026170771812

Variable Format: numeric

Notes: UNF:6:LnzFGDWX2x8lzHmPujr+0g==

f10853749 Location:

Summary Statistics: StDev 0.3464571214236862; Min. -0.23924522200490808; Max. 1.765737325056269; Valid 1359.0; Mean 0.722498588930756

Variable Format: numeric

Notes: UNF:6:icV0+3NiPYE7u5Owa48WnA==

f10853749 Location:

Summary Statistics: StDev 0.3945092916613935; Max. 0.128; Mean -0.7794573304157549; Min. -1.744; Valid 1371.0;

Variable Format: numeric

Notes: UNF:6:TdRS0sk5yeAyFC3nhx2zVg==

f10853749 Location:

Summary Statistics: StDev 0.32914991665856735; Max. 1.57; Mean 0.6922856099342586; Valid 1369.0; Min. -0.238

Variable Format: numeric

Notes: UNF:6:++hA+EB3dbQuH2Y4QkoGmg==

f10853749 Location:

Summary Statistics: Mean 0.05546170678336983; StDev 0.8471470682734988; Valid 1371.0; Min. -1.697; Max. 1.57;

Variable Format: numeric

Notes: UNF:6:dOXttdhCG/YBqFpNjEFSjQ==

f10853749 Location:

Summary Statistics: Valid 1369.0; StDev 0.7811540193620005; Max. 1.413; Min. -1.744; Mean -0.1438531775018262

Variable Format: numeric

Notes: UNF:6:xVxTR8Tn3adRXMCa6gpStw==

f10853749 Location:

Summary Statistics: Mean -0.7854143138603964; StDev 0.3856840827738708; Valid 1371.0; Max. 0.10734389414531335; Min. -1.8626470358786893

Variable Format: numeric

Notes: UNF:6:v7AKeOKlk940Xe91XXObgg==

f10853749 Location:

Summary Statistics: Min. -0.21910151005033235; Mean 0.7072712933141665; StDev 0.3291450382187436; Valid 1369.0; Max. 1.4774064315154563;

Variable Format: numeric

Notes: UNF:6:DXxF5IfO7kT+Isgbhi4fdA==

f10853749 Location:

Summary Statistics: StDev 0.5137282773148125; Valid 1359.0; Min. 0.101; Mean 1.5225459896983076; Max. 3.307

Variable Format: numeric

Notes: UNF:6:aa2RgF6BuSDtq0z9DMoxjw==

f10853749 Location:

Summary Statistics: Max. 3.061; Mean 1.4715887509130752; Valid 1369.0; Min. 0.19; StDev 0.5079058610070327;

Variable Format: numeric

Notes: UNF:6:Q7RUq0epP2U9TwOuozJPvw==

f10853749 Location:

Summary Statistics: Max. 1.9933504676975469; Mean 0.8753790940828645; StDev 0.29182177215825567; Valid 1359.0; Min. 0.10338683113043592;

Variable Format: numeric

Notes: UNF:6:hW59Zd6d86dBkqYjzFrfxg==

f10853749 Location:

Summary Statistics: Valid 1371.0; Max. 1.772497050404087; StDev 0.29213971865833055; Mean 0.8402297719238958; Min. 0.12401726271114506

Variable Format: numeric

Notes: UNF:6:rBWJvZyfsFBAEow0MLm1KQ==

f10853749 Location:

Summary Statistics: Mean 0.29906122080850744; Max. 0.9004416777927922; StDev 0.11029251386128155; Valid 1359.0; Min. 0.058158053460062774

Variable Format: numeric

Notes: UNF:6:HjWTIx3IiLz+o2wleuznXw==

f10853749 Location:

Summary Statistics: Valid 1371.0; Max. 0.8959930918147624; Mean 0.2880892783779573; Min. 0.07379590588589534; StDev 0.12119695502201856

Variable Format: numeric

Notes: UNF:6:VaVzJLM/4FxJTUt2Z0uiwQ==

f10853749 Location:

Summary Statistics: StDev 0.10419542252833773; Min. 0.028910533969954563; Valid 1359.0; Max. 0.8477587669807649; Mean 0.2699120845401414;

Variable Format: numeric

Notes: UNF:6:vDu1x9XxNYNq4pWi0vClaw==

f10853749 Location:

Summary Statistics: Min. 0.026979772897190366; Max. 0.87650045584893; Mean 0.2674162499974508; StDev 0.12965536717430987; Valid 1359.0

Variable Format: numeric

Notes: UNF:6:7oXEv8Gx+3Dam/Z5O7ynFw==

f10853749 Location:

Summary Statistics: Min. 0.09968640044168318; Valid 1359.0; StDev 0.25955362906248014; Max. 1.796381964354203; Mean 0.7915390619944653

Variable Format: numeric

Notes: UNF:6:ufHgF8aO8vBr6FU4MPqeHA==

f10853749 Location:

Summary Statistics: StDev 0.25400691509848355; Valid 1371.0; Min. 0.10994619033121696; Mean 0.7637189119617616; Max. 1.5984735161788588;

Variable Format: numeric

Notes: UNF:6:fEcPZhvcorFw1KNbxNDADQ==

f10853749 Location:

Summary Statistics: StDev 0.015747797464418827; Valid 1359.0; Mean 0.031890360559234734; Min. 0.01; Max. 0.157;

Variable Format: numeric

Notes: UNF:6:DDohEFLLEjTuLnqccr693w==

f10853749 Location:

Summary Statistics: StDev 0.015218651709954942; Max. 0.13; Valid 1359.0; Mean 0.02861810154525386; Min. 0.007;

Variable Format: numeric

Notes: UNF:6:2q4d+GE8ihZ/evuAjka3VQ==

f10853749 Location:

Summary Statistics: StDev 0.011774233818010857; Valid 1359.0; Max. 0.079; Mean 0.0266401766004415; Min. 0.007

Variable Format: numeric

Notes: UNF:6:BOWnkcRSXRkr7E5H68rkdg==

f10853749 Location:

Summary Statistics: StDev 0.013122135306790341; Min. 0.007; Max. 0.094; Mean 0.02542752023546726; Valid 1359.0;

Variable Format: numeric

Notes: UNF:6:JkI4lE0JCJHCVOPLFmtVxw==

f10853749 Location:

Summary Statistics: Valid 1371.0; Min. 0.019; Mean 0.04603865791393144; Max. 0.17; StDev 0.019716104631674197;

Variable Format: numeric

Notes: UNF:6:n79ea7o9gWDpR1RP9c4/rQ==

f10853749 Location:

Summary Statistics: Max. 0.199; StDev 0.017587208633586027; Min. 0.016; Valid 1371.0; Mean 0.03886652078774617;

Variable Format: numeric

Notes: UNF:6:1zoT9jk0k6D+REcUMyarpg==

f10853749 Location:

Summary Statistics: Mean 0.04143170197224251; Valid 1369.0; Min. 0.016; Max. 0.332; StDev 0.028488633520481917

Variable Format: numeric

Notes: UNF:6:lLj3CoHRi8vPdSgoq6QQlQ==

f10853749 Location:

Summary Statistics: Max. 0.105; StDev 0.013204063341580098; Valid 1371.0; Min. 0.016; Mean 0.0354398249452954;

Variable Format: numeric

Notes: UNF:6:36Jk7pgE6/saOd96wdW0+A==

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shor and mccarty 2011 final apsr.pdf

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shor mccarty state aggregate data codebook jan 2025.pdf

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two decades of polarization - shor and mccarty 2022.pdf

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