time period bias

问题如下：

The SCI data most likely exhibits which type of bias?

选项：

A.Time-period

B.Survivorship

C.Data-mining

解释：

B is correct. The SCI data is an index that is not composed of the same number of firms each period because of firm failures and combinations through time, which is indicative of a survivorship bias.

A is incorrect. Time-period bias applies to inferences taken from data.

C is incorrect. Data-mining bias applies to inferences taken from data.

本题考查的是生存偏差

B是正确的。SCI数据是一个指数，它不是由每个时期相同数量的公司所组成，伴随着时间的推移，公司的倒闭和合并，这便产生了生存偏差。

A是不正确的。Time-period bias本题中并未体现。

C是不正确的。数据挖掘偏差本题中也未体现。