{"id":6439,"date":"2026-10-09T20:09:05","date_gmt":"2026-10-09T18:09:05","guid":{"rendered":"https:\/\/propaccount.com\/?post_type=glossary&p=6439"},"modified":"2026-10-09T20:09:05","modified_gmt":"2026-10-09T18:09:05","slug":"what-is-backtesting","status":"publish","type":"glossary","link":"https:\/\/propaccount.com\/fr\/resources\/glossary\/what-is-backtesting\/","title":{"rendered":"Qu'est-ce que le backtesting ?"},"content":{"rendered":"

Backtesting<\/b> est le processus consistant \u00e0 tester une strat\u00e9gie de trading par rapport \u00e0 des donn\u00e9es historiques du march\u00e9 pour voir comment elle se serait comport\u00e9e dans le pass\u00e9. Les traders d\u00e9finissent un ensemble de r\u00e8gles d'entr\u00e9e et de sortie, les appliquent \u00e0 un \u00e9chantillon de donn\u00e9es de prix historiques et enregistrent les transactions que la strat\u00e9gie aurait g\u00e9n\u00e9r\u00e9es. Le r\u00e9sultat est un rapport de performance indiquant le taux de r\u00e9ussite, le profit moyen par transaction, le drawdown maximum et d'autres indicateurs qui aident le trader \u00e0 \u00e9valuer si la strat\u00e9gie vaut la peine d'\u00eatre d\u00e9ploy\u00e9e avec du capital r\u00e9el.<\/span><\/p>\n

Le backtesting peut \u00eatre effectu\u00e9 manuellement en faisant d\u00e9filer des graphiques historiques et en marquant des transactions hypoth\u00e9tiques, ou automatiquement via un logiciel qui simule des milliers de transactions sur des ann\u00e9es de donn\u00e9es en quelques minutes. Le backtesting automatis\u00e9 est l'approche la plus courante, en particulier pour les traders utilisant des EA, des bots d'IA ou toute strat\u00e9gie dot\u00e9e de r\u00e8gles pr\u00e9cis\u00e9ment d\u00e9finies. La qualit\u00e9 du backtest d\u00e9pend fortement de la qualit\u00e9 des donn\u00e9es historiques, de l'inclusion de conditions r\u00e9alistes telles que le spread et le slippage, et de la fid\u00e9lit\u00e9 avec laquelle l'environnement simul\u00e9 correspond au trading r\u00e9el.<\/span><\/p>\n

Une strat\u00e9gie backtest\u00e9e qui semble rentable sur des donn\u00e9es historiques peut tout de m\u00eame \u00eatre moins performante sur les march\u00e9s r\u00e9els. Les conditions historiques ne se r\u00e9p\u00e8tent pas toujours ; les strat\u00e9gies peuvent \u00eatre surajust\u00e9es aux donn\u00e9es sp\u00e9cifiques sur lesquelles elles ont \u00e9t\u00e9 test\u00e9es, et l'ex\u00e9cution en temps r\u00e9el introduit du slippage, des variations de spread et des d\u00e9cisions \u00e9motionnelles que les backtests ignorent souvent. Pour les traders de prop firms, le backtesting est utile comme premier filtre pour la s\u00e9lection des strat\u00e9gies, mais il ne constitue pas un indicateur fiable de la performance lors d'un d\u00e9fi ou sur un compte financ\u00e9. La plupart des traders de prop firms qui r\u00e9ussissent r\u00e9guli\u00e8rement associent le backtesting au forward testing sur des comptes d\u00e9mo avant de s'engager dans un d\u00e9fi r\u00e9el.<\/span><\/p>","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"glossary-category":[131],"class_list":["post-6439","glossary","type-glossary","status-publish","hentry","glossary-category-trader-glossary"],"acf":{"target_keyword":"backtesting","glossary_post_image":"","key_takeaway":"Key Takeaway","key_takeaway_description":"Backtesting is the process of testing a trading strategy against historical market data to evaluate how it would have performed. It is useful as a first filter for strategy selection but has significant limits, including hindsight bias, overfitting, and the gap between simulated and live execution.","faq":"What metrics does a backtest typically report?<\/b>\r\n\r\nCommon metrics include win rate, average profit per winning trade, average loss per losing trade, maximum drawdown, profit factor, number of trades, and the overall return across the backtest period. More advanced reports also include risk-adjusted metrics such as the Sharpe ratio and expectancy per trade.<\/span>\r\n\r\nWhy do backtested strategies often underperform in live trading?<\/b>\r\n\r\nSeveral reasons. Backtests can be overfitted to specific historical conditions that do not repeat. They often exclude or underestimate real-world execution factors such as slippage, spread variation, and partial fills. And emotional decisions during live trading can cause traders to deviate from the rules the strategy was tested on. The gap between backtested results and live performance is one of the most common reasons new prop firm traders fail challenges.<\/span>\r\n\r\nIs backtesting worth doing before a prop firm challenge?<\/b>\r\n\r\nYes, as a first filter. A strategy that fails to produce profit in backtesting is unlikely to produce it in live markets. But passing a backtest does not guarantee passing a challenge. Most consistently successful prop firm traders combine backtesting with forward testing on a demo account before deploying the strategy on a live challenge.<\/span>"},"_links":{"self":[{"href":"https:\/\/propaccount.com\/fr\/wp-json\/wp\/v2\/glossary\/6439","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/propaccount.com\/fr\/wp-json\/wp\/v2\/glossary"}],"about":[{"href":"https:\/\/propaccount.com\/fr\/wp-json\/wp\/v2\/types\/glossary"}],"wp:attachment":[{"href":"https:\/\/propaccount.com\/fr\/wp-json\/wp\/v2\/media?parent=6439"}],"wp:term":[{"taxonomy":"glossary-category","embeddable":true,"href":"https:\/\/propaccount.com\/fr\/wp-json\/wp\/v2\/glossary-category?post=6439"}],"curies":[{"name":"WordPress","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}