... optional sampling 任意抽样 optional selection 任意抽样 Optrim efficiency, 优切尾效率 ...
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optional route selection 进路任意选择
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Academic estimates are that these statistical biases of self-selection (reporting is optional for the largely unregulated hedge fund industry) add 3-5 percentage points to index returns.
FORBES: Chasing the Mirage of Hedge Fund Returns
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