Thursday, April 25, 2019

Does VIF account for negative correlations?

Does VIF account for inverse correlation? For example if you have two variables that are negatively correlated, like lifesatisfaction and anxiety. If I do a regression of LifeSatisfaction = Anxiety, I get high explanatory power etc. with anxiety having a negative coefficient, which is too be expected. But yet if I do Y = lifesatisfaction + anxiety,, and do a VIF of that the VIF score is pretty moderate, around 4.4 for each.

Am I misunderstanding VIF or collinearity? Because my assumption of the above scenario would be that the VIF should be high, not moderate.

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