One of the ways to detect multicollinearity is to examine the Variance Inflation Factor (VIF). In this method, the statistical software calculates the VIF for the predictive variables. What VIF values suggest multicollinearity?

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When evaluating multicollinearity using the Variance Inflation Factor (VIF), several threshold suggestions exist, and careful interpretation is key.
Option 1: 'VIF > 9.0' — This is a common rule-of-thumb threshold indicating substantial multicollinearity; variables with VIFs above this level are often scrutinized for redundancy or model instability.
Option 2: 'VIF > 0.5' — This is not a standard indicator of multicollinearity. A VIF less than 1 would imply that the predictor does not have extra multicollinearity beyond what is expected, so a threshold of 0.5 would be neither typical nor meaningful in flagging problems.
Option 3: 'VIF > 30.0' — While extremely high VIF values can occur and signal severe multicollinearity, 30.0 is a much more extreme cutoff than commonly recommended; some contexts might alert at very high values, but it is not the conventional standard used in introductory or many applied analyses.
Option 4: 'VIF > 3.14159' — This value seems arbitrary and does not match standard practice. There is no widely accepted threshold around pi to denote problematic multicollinearity.
In summary, among the listed choices, the threshold that aligns with typical guidelines for flagging multicollinearity in practice is VIF > 9.0, since it represents a moderate to substantial level of collinearity warranting attention, whereas the others either lack conventional support or are misaligned with standard interpretation.

2025WI_MSDS_410-DL_SEC56 Quiz #3: Advanced Modeling Topics

One of the ways to detect multicollinearity is to examine the Variance Inflation Factor (VIF). In this method, the statistical software calculates the VIF for the predictive variables. What VIF values suggest multicollinearity?

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