Unverified50% confidenceConceptExact time
Answer balancing requires that the yes/no labels of each question type be roughly matched in distribution, so that the expected accuracy of random guessing stays around 50%.
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10/15/2026
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Unverified一个随机猜测的模型在单次二元预测中有50%的概率押中79% similarUnverifiedWhen evaluating a binary classification model, the majority-class baseline when positive and negative samples are evenly split means a model that always predicts 'normal' can also achieve 50% accuracy.73% similarUnverifiedWhen a team tests 1,000 combinations of strategy parameters, even if all combinations have zero predictive power, roughly 50 combinations will appear to perform excellently in backtesting purely due to randomness (the multiple comparisons problem).70% similarUnverifiedIn time-series direction forecasting, the correct baseline should be the majority class proportion rather than 50%, because if 51% of movements are upward, 'always guess up' achieves 51% accuracy.70% similarUnverifiedPaired comparison is more reliable than independent evaluation because it eliminates randomness introduced by sample selection.70% similar
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