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Vincent2019-06-17 18:37:50
同学你好,
look -ahead bias是 uses information that was not available on the test date. 也就是在计算各类financial ratio的时候,某些数字已经产生,但还没有公布,这时我只能预测一个,这属于look-ahead bias.
那么sample selection bias 是 要缺少数据leads to certain assets being excluded from the analysis.
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