问题如下:
Which of the following characteristics of an investment study most likely indicates time period bias?
选项:
A.The study is based on a short time-series.
B.Information not available on the test date is used.
C.A structural change occurred prior to the start of the study’s time series.
解释:
A is correct.
A short time series is likely to give period-specific results that may not reflect a longer time period.
B选项test data是啥意思?以及为什么这种是前视偏差呀?课堂上举的前视偏差例子就没太听明白。