In Chapter 6, we give an introduction to ETF. It is about its index of error of foresee and decomposition.

第六章介绍了ETF指数基金之跟踪误差预测和分解。

youdao

A performance index of error was presented. This index is a kind of evaluation of neural fuzzy model performance and synthetically considered training error and checking error of NFS.

提出了一种综合考虑了训练误差和检验误差的评价神经模糊模型性能的误差性能指标。

youdao

Some of the typical string-related checks include verifying that an empty string has 0 size and accessing out of index from the string results in an error message/exception.

与字符串相关的典型检查包括检查空字符串的长度是否为 0 以及访问范围超出索引是否导致错误消息/异常。

youdao

The exception is right there. It's an index error, that is it's trying to do something going beyond the range of what this thing could deal with.

但他事实上抛出一个异常，异常就在这里，这是一个下标错误,它是试图去取超出范围的元素造成的。

麻省理工公开课 - 计算机科学及编程导论课程节选

The expectation that an index fund will get EXACTLY the return of the target index sets the stage for an interesting problem: Zero tracking error is achievable, but it comes at a very high price.

FORBES: Getting Over Index Investing With A Better Way

In order to achieve zero tracking error, the fund manager must hold exactly the index for every second of the day.

FORBES: Getting Over Index Investing With A Better Way

These two scenarios can create an environment where performance expectations of investors may not be met due to the tracking error versus the underlying commodity index that is created.

FORBES: Three Ways To Gain Exposure To Oil