D为什么不对呀？

问题如下：

Phoenix is the CRO of Blackstone Commercial Bank. In the process of modeling, he found that if the data window is taken too short, the error of the model will be larger. To solve this problem, he extended the data window to include earlier data, but it brought new problems. Which of the following options describes this new problem?

选项：

A.

put higher weight on new information.

B.

Causing greater model error.

C.

The weight of past stale data is relatively high, while they are actually useless.

D.

Computational complexity will increase significantly

解释：

C is correct.

考点： Common Valuation and Estimation Errors

解析：向模型添加更多的数据，可减少估计误差、提高统计的功效。 但是，添加的数据如果过多，那么就会包含进过多太陈旧的信息，即过分重视过时的信息，毕竟这些信息现在可能无关紧要。因此选C。其他选都是凑选项的。