Variance inflation factor calculator
Enter R² from the auxiliary regression of the selected predictor on every other predictor in the model.
How do I use this page?
- Fit the auxiliary regression of one predictor on all others.
- Enter the resulting R²j.
- Read VIF, tolerance and √VIF.
What this page does not do: The calculator requires auxiliary R²j. It does not derive R² without the raw data matrix or decide whether a predictor should be removed.
Further reading
Theory — what is the variance inflation factor (VIF)?
VIF, the variance inflation factor, shows how much larger a regression coefficient's variance can be due to linear dependence of that predictor on the others. Tolerance is the inverse of VIF, and a VIF of 1 means the predictor is not linearly explained by the remaining variables. The calculator requires the R² from an auxiliary regression of the chosen predictor on all other predictors in the model. A threshold of 5 or 10 is sometimes used as a warning sign, but it is not a fixed rule.
Frequently asked questions
What does VIF=1 mean?
Can VIF be below 1?
See also
A/B test calculator
Compare two proportions in an A/B test. Calculate conversion rates, difference, uplift, z score, p value and c
A/B test planning — sample size, MDE and duration
Plan a two-proportion experiment, estimate detectable effect and traffic duration.
ACF and PACF autocorrelation calculator
Calculate ACF and PACF across time-series lags. Review the chart, reference bounds and coefficient table.