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六姑娘 · 2023年07月12日

这题不懂的地方?

* 问题详情,请 查看题干

NO.PZ202212300100014201

问题如下:

Based on Exhibit 1, Olabudo should calculate a prediction interval for the actual US CPI closest to:

选项:

A.2.7506 to 2.7544 B.2.7521 to 2.7529 C.2.7981 to 2.8019

解释:

The forecast interval for inflation is calculated in three steps:

Step 1. Make the prediction given the US CPI forecast of 2.8:


Step 2. Compute the variance of the prediction error:


Step 3. Compute the prediction interval:

2.7525 ± (2.0 × 0.0009)

Lower bound: 2.7525 − (2.0 × 0.0009) = 2.7506.

Upper bound: 2.7525 + (2.0 × 0.0009) = 2.7544.

So, given the US CPI forecast of 2.8, the 95% prediction interval is 2.7506 to 2.7544.

这题的第一步是点估计吗


2.7525是等于bi(^)吗?不太理解是什么意思?


1 个答案

星星_品职助教 · 2023年07月13日

同学你好,

2.7527是Y cap的点估计,即下图中的Yf cap,和b1无关。

得到Yf cap后,代入置信区间公式,即可求得题目要求的区间。

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NO.PZ202212300100014201 问题如下 Baseon Exhibit 1, Olabu shoulcalculate aprection intervfor the actuUS CPI closest to: A.2.7506 to 2.7544 B.2.7521 to 2.7529 C.2.7981 to 2.8019 The forecastintervfor inflation is calculatein three steps:Step 1. Make theprection given the US CPI forecast of 2.8: Step 2. Computethe varianof the prection error: Step 3. Computethe prection interval: 2.7525 ± (2.0 ×0.0009)Lower boun2.7525 − (2.0 × 0.0009) = 2.7506.Upper boun2.7525 + (2.0 × 0.0009) = 2.7544.So,given the US CPI forecast of 2.8, the 95% prection intervis 2.7506 to2.7544. 请问2.7525 ± (2.0 × 0.0009)是怎么得出的?为什么?另外上面一大串的公式要背下来吗?

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2023-08-07 16:23 2 · 回答