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不泊岸 · 2021年11月13日

题目中的greater意思是更大还是更好。。理解错了正好全选反,这种题意的问题怎么注意呢?

NO.PZ2016062402000036

问题如下:

The measurement error in VAR, due to sampling variation, should be greater with

选项:

A.

More observations and a high confidence level (e.g. , 99%)

B.

Fewer observations and a high confidence level

C.

More observations and a low confidence level (e.g. , 95%)

D.

Fewer observations and a low confidence level

解释:

Sampling variability (or imprecision) increases with (1) fewer observations and (2) greater confidence levels. To show (1), we can refer to the formula for the precision of the sample mean, which varies inversely with the square root of the number of data points. A similar reasoning applies to (2). A greater confidence level involves fewer observations in the left tails, from which VAR is computed.


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品职答疑小助手雍 · 2021年11月13日

同学你好,不会有“更好”的意思的。只有更大的意思

所以题目问的是在以下哪个选项的条件中,计算出VaR的误差会比较大。


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