NO.PZ2018062016000118
问题如下：
If analyst used the current company list of manufacturing industry, which bias is most likely exist?
选项：
A. Survivorship bias
B. Data-mining bias
C. Time-period bias
解释：
A is correct, by definition, survivorship bias is usually derives from sample selection for only the existing portfolio are included.
根据定义，幸存者偏差通常源自样本选择，因为样本中仅仅包括现有投资组合，而失败的投资组合无法被统计。
为什么不是time period呢
