问一道题：NO.PZ2017092702000116 [ CFA I ]

问题如下：

A report on long-term stock returns focused exclusively on all currently publicly traded firms in an industry is most likely susceptible to:

选项：

look-ahead bias.

survivorship bias.

intergenerational data mining.

解释：

B is correct.

A report that uses a current list of stocks does not account for firms that failed, merged, or otherwise disappeared from the public equity market in previous years. As a consequence, the report is biased. This type of bias is known as survivorship bias.

老师，请把题目翻译一下呢

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星星_品职助教 · 2020年09月12日

同学你好，

题干的意思是一个分析长期股票收益的报告里涉及的股票都是目前的上市公司的股票，问这种分析方法会导致什么bias。

这是一个典型的sample selection bias，即选择样本的时候没有选全。更具体的来说，这属于sample selection bias下的survivorship bias，即只选择了目前还在上市的成功公司的股票进行分析，但是对于那些失败者即退市的，被收购的，破产的公司的股票没有进行分析。这样的分析显然是不全面的。

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NO.PZ2017092702000116 问题如下 A report on long-term storeturns focuseexclusively on all currently publicly trafirms in instry is most likely susceptible to: A.look-ahebias. B.survivorship bias. C.intergenerationta mining. B is correct. A report thuses a current list of stocks es not account for firms thfaile merge or otherwise sappearefrom the public equity market in previous years. a consequence, the report is biase This type of biis known survivorship bias.一份使用当前股票清单的报告，且没有包括那些因为失败、合并而退出市场的公司。因此，该报告存在偏见。这种类型的偏见被称为幸存者偏差。请问这个考点是哪一章的reang中的

2022-07-26 09:59 1 · 回答

survivorship bias. intergenerationta mining. B is correct. A report thuses a current list of stocks es not account for firms thfaile merge or otherwise sappearefrom the public equity market in previous years. a consequence, the report is biase This type of biis known survivorship bias.请问A是什么意思呢？一直都没弄明白

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C是什么含义？两代间的数据开采？也是一个偏差类型吗？

2018-11-20 21:55 1 · 回答

can' t unrstanexplanation, want to know fferenbetween look-ahebiansurvivorship bias

2018-11-14 22:32 1 · 回答

问一道题：NO.PZ2017092702000116 [ CFA I ]

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