Date filters on major search engines frequently leak post-cutoff information, inflating Brier scores in retrospective forecasting from 0.24 to 0.10.
This will be resolved based on an official statement by NATO, for example by the new state being in- cluded in the member list on NATO’s official web- site
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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.