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We write about competition context, pre-match analysis, betting angles, live signals and the way sport decisions change when data and match rhythm move together.

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SPORTEXA AI / JOURNAL

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THE JOURNAL

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03 articles

General topics

04 October 2026 3 min read

Future Data Leakage in Betting Backtests: How to Detect It

Check that a backtest uses only information available before a decision, and see why randomly shuffling matches can overstate performance.

AI Sports Analytics General topics Advanced

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Hockey

04 October 2026 3 min read

Hockey GSAx: Goals Saved Above Expectation and Model Limits

Define GSAx as xGA minus goals allowed, work through an example, and separate the metric from save percentage and GSAA.

AI Sports Analytics Hockey Advanced

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General topics

24 September 2026 3 min read

Betting Hit Rate and Confidence Intervals: What 60% Does Not Tell You

A 60-from-100 example uses a Wilson interval to show sampling uncertainty and why hit rate is not the same as profitability.

Bankroll & Mathematics General topics Advanced

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Articles: Advanced

Latest articles

Future Data Leakage in Betting Backtests: How to Detect It

Hockey GSAx: Goals Saved Above Expectation and Model Limits

Betting Hit Rate and Confidence Intervals: What 60% Does Not Tell You

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