前视偏误（look-ahead bias） 是什么意思 英语
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【答案】 Hi,I believe youre studing CFA I.LOL.
Bias created by the use of information or data in a study or simulation that would not have been known or available during the period being analyzed.This will usually lead to inaccurate results in the study or simulation.
example:
if an investor is backtesting the performance of a trading strategy,it is vital that he or she only uses information that would have been available at the time of the trade.For example,if a trade is simulated based on information that was not available at the time of the trade - such as a quarterly earnings number that was released three months later - it will diminish the accuracy of the trade's true performance.