2650机器学习困难数值题medium
Usable Training Days After Purging and Embargo
题目
A 100-day event-study sample uses a contiguous 20-day validation block in the middle. Labels look ahead 5 days, and you impose a 2-day embargo on each side of the validation block. How many days remain usable for training?
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提交作答时记录，用于后续平均用时统计。
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