NO.PZ2023010903000045
问题如下：
Leeter tells Clickman about the interesting investment process of the XTZZ Fund. Leeter states that many times, government- reported data are revised three to six months after the data are initially reported. These revisions then become incorporated into the historical data, with the revised value replacing the originally reported value. When the revision is incorporated, the data are referred to as “clean data.” XTZZ applies its analysis in a manner in which the originally reported data exist as a lagged factor until the revised data become available. This approach differentiates XTZZ from funds that use only the “clean” data, which ignore the initially reported data values.
XTZZ’s approach to analyzing government-reported data most likely reduces:
选项：
A.look-ahead bias
survivorship bias
model overfitting
解释：
XTZZ’s approach prevents the use of “revised” government data that are not known when the data are initially reported. By not incorporating revised government data until they are actually revealed, XTZZ reduces look-ahead bias.
B is incorrect. Survivorship bias occurs when analysis on past data ignores firms that have ceased to exist at some point during the analysis period.
C is incorrect. Model overfitting occurs when the model fits the past data by finding a pre-conceived relationship (i.e., making the model specifications biased toward the pre-relationship) or when the model is biased toward patterns that are specific only to the past data.
是数据有滞后性，就会有look-ahead bias吗？还是数据太前沿了就不对？
麻烦老师解释一下，谢谢。
