Unverified50% confidenceTradeoffExact time
Walk-Forward分析中扩展窗口累积所有历史数据但可能受远古市场环境污染，滚动窗口保持固定大小更适应近期特征但牺牲样本量
1
Sources
50%
Confidence
Long-term
Relevance
8/12/2026
First Seen
Sources
金融机器学习模型为何难以评估？核心挑战与避坑指南
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