השוואת שיטות

	Anchoring Vignettes	Expert Survey
תחום	Political Science	Political Science
משפחה	Process / pipeline	Process / pipeline
שנת המקור	2004	—
הוגה השיטה	Gary King, Christopher Murray, Joshua Salomon & Ajay Tandon	Comparative party-positioning research (Castles & Mair; Chapel Hill team)
סוג	Survey measurement-correction method	Survey of subject-matter experts to measure latent positions
מקור מכונן	King, G., Murray, C. J. L., Salomon, J. A., & Tandon, A. (2004). Enhancing the Validity and Cross-Cultural Comparability of Measurement in Survey Research. American Political Science Review, 98(1), 191–207.	Bakker, R., de Vries, C., Edwards, E., Hooghe, L., Jolly, S., Marks, G., Polk, J., Rovny, J., Steenbergen, M., & Vachudova, M. A. (2015). Measuring Party Positions in Europe: The Chapel Hill Expert Survey Trend File, 1999–2010. Party Politics, 21(1), 143–152.
כינויים	King anchoring vignettes, Vignette anchoring method, DIF correction via vignettes, Anchoring vignette rescaling	Expert judgment survey, Party expert survey, Chapel Hill Expert Survey, Expert placement survey
קשורות	3	4
תקציר	Anchoring vignettes are a survey method for making self-assessments comparable across people and cultures. When respondents are asked to rate their own political efficacy, health, or freedom on an ordinal scale, different groups interpret the scale differently — what one culture calls 'a lot of freedom' another calls 'some.' This differential item functioning makes raw self-reports incomparable. The method, introduced by King, Murray, Salomon, and Tandon in 2004, has each respondent also rate several hypothetical characters described identically to everyone, then uses those vignette ratings to recover where each respondent's own scale lies and to rescale their self-assessment onto a common metric.	An expert survey measures latent political quantities — most often parties' positions on policy dimensions — by asking a panel of country and subject-matter experts to place the objects of interest on structured numerical scales. Averaging many experts' judgments yields position estimates, while the spread across experts provides a built-in measure of uncertainty and reliability. The Chapel Hill Expert Survey is the leading example, producing comparable measures of European parties' positions on ideology, European integration, and many specific issues over time.