Date filters on major search engines frequently leak post-cutoff information, inflating Brier scores in retrospective forecasting from 0.24 to 0.10.
Technical report, Center for AI Safety and University of California, Berkeley
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Temporal Leakage in Search-Engine Date-Filtered Web Retrieval: A Retrospective Forecasting Case Study
Date filters on major search engines frequently leak post-cutoff information, inflating Brier scores in retrospective forecasting from 0.24 to 0.10.