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- W148960571 abstract "Using state-level poll data, we analyze Obama’s out- and underperformance of the predictions in the 2008 US presidential elections. The analyses show that the polls systematically mispredicted state margins. While they were unconditionally unbiased, i.e., accurate on average, they were conditionally biased. The stronger the frontrunner was projected to be, the more he outperformed the prediction, providing evidence for voter polarization not anticipated in the polls. We further contrast social desirability, sample selection, and momentum neglect by proposing which state-level social and demographic indicators capture which of the three biases and hypothesize the direction of the effect under the proposed biases. Numerous state-level indicators relate to Obama out- or underperforming the prediction and account for nearly 60 percent of the variance in the prediction error, falsifying that the prediction error was random. Net of other influences, Obama outperformed where unemployment and education were higher, in states with many non-English speakers, and where a greater share of people lived in nonfamily households. Obama underperformed where per-capita income was higher, where a greater share of people had no health insurance, where a greater share of people lived in metropolitan areas, and where religious diversity was low. The directions of these effects suggest that all three biases - social desirability, sample selection, and momentum neglect - may have been present in the polls. The study underscores the benefits of a theory-driven approach to jointly analyzing multiple sources of bias." @default.
- W148960571 created "2016-06-24" @default.
- W148960571 creator A5072495664 @default.
- W148960571 date "2010-01-01" @default.
- W148960571 modified "2023-09-25" @default.
- W148960571 title "Analyzing Obama’s Out- and Under Performance in the 2008 Presidential Elections: Social Desirability Bias, Sample Selection, and Momentum Neglect in the Polls" @default.
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- W148960571 doi "https://doi.org/10.2139/ssrn.1623204" @default.
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