{"id":253239,"date":"2026-08-11T11:41:35","date_gmt":"2026-08-11T15:41:35","guid":{"rendered":"https:\/\/ibkrcampus.com\/campus\/?post_type=glossary-terms&#038;p=253239"},"modified":"2026-08-17T16:44:29","modified_gmt":"2026-08-17T20:44:29","slug":"brier-score","status":"publish","type":"glossary-terms","link":"https:\/\/www.interactivebrokers.com\/campus\/glossary-terms\/brier-score\/","title":{"rendered":"Brier Score"},"content":{"rendered":"\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-50\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/ndcdyn.interactivebrokers.com\/mkt\/?src=glossGenAcc&amp;url=%2FUniversal%2FApplication\" target=\"_blank\" rel=\"noreferrer noopener\">Open Account<\/a><\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Brier score measures the accuracy of probabilistic forecasts as the mean squared difference between the forecast probability and the outcome coded as one or zero. Lower values indicate better performance, with a perfect forecast scoring zero and a forecast that always says 50% scoring 0.25. Because prediction market prices are already expressed as probabilities, Brier scores allow direct comparison between market-implied odds and the probabilities produced by ensemble weather models or other forecasting systems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.interactivebrokers.com\/campus\/traders-insight\/ibkr-climate-energy\/forecastex-odds-of-a-major-hurricane-landfall-compared-to-weather-models\/\">ForecastEx Odds of a Major Hurricane Landfall Compared to Weather Models<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Brier score measures the accuracy of probabilistic forecasts as the mean squared difference between the forecast probability and the outcome coded as one or zero. Lower values indicate better performance, with a perfect forecast scoring zero and a forecast that always says 50% scoring 0.25. Because prediction market prices are already expressed as probabilities, Brier scores allow direct comparison between market-implied odds and the probabilities produced by ensemble weather models or other forecasting systems.<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"traders-glossary":[13253,13251],"class_list":["post-253239","glossary-terms","type-glossary-terms","status-publish","traders-glossary-trading-terms-b","traders-glossary-trading-alphabet"],"pp_statuses_selecting_workflow":false,"pp_workflow_action":"current","pp_status_selection":"publish","acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.9 (Yoast SEO v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Archives Term | IBKR Glossary | IBKR Campus<\/title>\n<meta name=\"description\" content=\"The Brier score measures the accuracy of probabilistic forecasts as the mean squared 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