Choose variables based on
𝑉
𝐼
𝐹
𝑗
values. For a dataset with 4 independent variable,
𝑉
𝐼
𝐹
1
=
1.54
,
𝑉
𝐼
𝐹
2
=
5.54
,
𝑉
𝐼
𝐹
3
=
7.89
,
𝑉
𝐼
𝐹
4
=
6.90
, we should

Question

Choose variables based on 
𝑉
𝐼
𝐹
𝑗
 values. For a dataset with 4 independent variable, 
𝑉
𝐼
𝐹
1
=
1.54
, 
𝑉
𝐼
𝐹
2
=
5.54
, 
𝑉
𝐼
𝐹
3
=
7.89
, 
𝑉
𝐼
𝐹
4
=
6.90
, we should

BlackTom AI · Accepted Answer

Here we have a question about selecting variables based on VIF values for a dataset with four independent variables. The given VIF values are: VIF1 = 1.54, VIF2 = 5.54, VIF3 = 7.89, VIF4 = 6.90. Since the answer presented is 'delete X3.', we can evaluate why that choice might be reasonable, and also discuss the context in which other actions could be considered.

First, consider the general goal: multicollinearity among predictors is often addressed by removing variables with high VIFs. A common threshold is 5 (some use 10). Here, VIF3 = 7.89 and VIF4 = 6.90 exceed 5, and VIF2 = 5.54 also exceeds 5. Under a strict rule of removing the highest VIF to reduce multicollinearity, X3 (with VIF 7.89) is the prime candidate for removal because it has the largest value, suggesting it contributes most to collinearity in the model.

However, notice that simply deleting X3 does not bring all remaining VIFs below 5. After removing X3, the remaining VIFs would be: VIF1 = 1.54, VIF2 = 5.54, VIF4 = 6.90. Both X2 and X4 would still have VIFs above 5, indicating persistent multicollinearity among the remaining variables. This observation highlights a potential limitation: removing only the single highest-VIF predictor may not fully address multicollinearity if several predictors are involved. In practice, one might consider:
- Removing multiple variables with high VIFs (e.g., X2 and/or X4 in addition to X3) until all remaining VIFs are below the chosen threshold.
- Using a different modeling approach (ridge regression, principal components, or variance inflation factor adjustments) to mitigate multicollinearity without discarding all predictors.

Why option 'delete X3' could be chosen despite the caveat:
- It targets the single largest contributor to multicollinearity (the highest VIF), aiming to reduce the overall level of collinearity in one step.
- In contexts where model simplification is prioritized or where the researcher wants to start by removing the most problematic predictor, X3 is a reasonable first action.

Why not other unnamed options would be preferred here (based on typical reasoning):
- If there were an option to delete X2 or X4 only, it might overlook the fact that X3 has the maximum VIF, which is usually the most compelling first target for removal when reducing multicollinearity.
- If there were an option to delete more than one variable at once, that might be more effective given that multiple predictors exceed the threshold, but the provided answer focuses on a single-variable deletion, which is a common initial step.
- If the task demanded preserving all predictors, one would discuss alternative approaches (e.g., regularization, PCA) rather than deletion, but since the prompt centers on variable deletion by VIF, removal of the highest VIF is a defensible first move.

In summary, 'delete X3' aligns with the strategy of targeting the predictor with the highest VIF to reduce multicollinearity, even though a more thorough approach might require removing additional high-VIF variables or applying alternative methods after the initial step. The other possibilities would either ignore the largest contributor to multicollinearity or fail to address the broader issue among multiple predictors.

33:136:385:6&12&15 STAT METH BUSINESS Sample questions for final exam

Choose variables based on 𝑉 𝐼 𝐹 𝑗 values. For a dataset with 4 independent variable, 𝑉 𝐼 𝐹 1 = 1.54 , 𝑉 𝐼 𝐹 2 = 5.54 , 𝑉 𝐼 𝐹 3 = 7.89 , 𝑉 𝐼 𝐹 4 = 6.90 , we should

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