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Extracting Policy Positions from Political Texts Using Words as Data


We present a new way of extracting policy positions from political texts that treats texts not as discourses to be understood and interpreted but rather, as data in the form of words. We compare this approach to previous methods of text analysis and use it to replicate published estimates of the policy positions of political parties in Britain and Ireland, on both economic and social policy dimensions. We “export” the method to a non-English-language environment, analyzing the policy positions of German parties, including the PDS as it entered the former West German party system. Finally, we extend its application beyond the analysis of party manifestos, to the estimation of political positions from legislative speeches. Our “language-blind” word scoring technique successfully replicates published policy estimates without the substantial costs of time and labor that these require. Furthermore, unlike in any previous method for extracting policy positions from political texts, we provide uncertainty measures for our estimates, allowing analysts to make informed judgments of the extent to which differences between two estimated policy positions can be viewed as significant or merely as products of measurement error.We thank Raj Chari, Gary King, Michael McDonald, Gail McElroy, and three anonymous reviewers for comments on drafts of this paper.

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AdamsJ.2001A Theory of Spatial Competition with Biased Voters: Party Policies Viewed Temporally and ComparativelyBritish Journal of Political Science31121-58

BaronDavid1991A Spatial Bargaining Theory of Government Formation in Parliamentary SystemsAmerican Political Science Review85137-64

BaronDavid1993Government Formation and Endogenous PartiesAmerican Political Science Review873447

BlaisA.D.BlakeS.Dion1993Do Parties Make a Difference—Parties and the Size of Government in Liberal DemocraciesAmerican Journal of Political Science374062

CastlesPeterMair1984Left-Right Political Scales: Some Expert JudgmentsEuropean Journal of Political Research128388

GabelMatthewJohnHuber2000Putting Parties in Their Place: Inferring Party Left-Right Ideological Positions from Party Manifesto DataAmerican Journal of Political Science4494103

KimH. M.FordingR. C.1998Voter Ideology in Western Democracies, 1946–1989European Journal of Political Research337397

KitchsheltHerbert1994The Transformation of European Social DemocracyCambridgeCambridge University Press.

LaverMichael1994Party Policy and Cabinet Portfolios in Ireland 1992: Results from an Expert SurveyIrish Political Studies9157-64

LaverMichael1998aParty Policy in Britain, 1997: Results from an Expert SurveyPolitical Studies46336-47

LaverMichael1998bParty Policy in Ireland, 1997: Results from an Expert SurveyIrish Political Studies13159-71

LaverMichaelKennethBenoit2002Locating TDs in Policy Spaces: Wordscoring D´ail SpeechesIrish Political Studies17Summer5973

LaverMichaelJohnGarry2000Estimating Policy Positions from Political TextsAmerican Journal of Political Science44619-34

LaverMichaelNormanSchofield1998Multiparty Government: The Politics of Coalition in EuropeAnn ArborUniversity of Michigan Press

SchofieldN.RParks2000Nash Equilibrium in a Spatial Model of Coalition BargainingMathematical Social Science39133-74

WarwickPaul2001Coalition Policy in Parliamentary Democracies—Who Gets How Much and WhyComparative Political Studies341212-36

WarwickPaul2002Toward a Common Dimensionality in West European Policy SpacesParty Politics8101-22

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American Political Science Review
  • ISSN: 0003-0554
  • EISSN: 1537-5943
  • URL: /core/journals/american-political-science-review
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