Calculate root variance inflation factors (RVIF) for terms in a fitted model(s), i.e. the square root of the (generalised) VIFs.

RVIF(...)

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A numeric vector of the RVIFs, or an array, list of vectors/arrays, or nested list.

RVIFs quantify the inflation of estimate standard errors due to multicollinearity among predictors, and also of estimates themselves compared to the 'unique' (residualised) effects. RVIFs may often be more practical than VIFs for assessing multicollinearity, relating more directly to the parameters of interest.