kathy sham2024-01-20 11:24:18
Look ahead bias 有什麼問題?有什麼缺點?包了新data 不是更好嗎?
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梁雪2024-01-21 10:51:58
同学你好,The second major issue in back-testing is look-ahead bias. This bias results from using information that was unknown or unavailable at the time an investment decision was made. An example of this bias is the use of financial accounting data for a company at a point in time before the data were actually released by the company.
该bias是在量化模型的决策中用到了当时还未知的数据,比如量化模型中用到了PE数据,但在模型决策时点,公司的财报并未披露,不知道EPS是多少。
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如數據未知那從那裏來?
Simon2024-02-02 11:46:00
同学,上午好。如果数据未知,那么在回测时,就要等到数据实际公布之后,再把数据纳入到回测中。其实就是等数据公布后,再用到模型里。
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