AICc_permanova2         Calculate AICc for a permutational multivariate
                        analysis of variance (PERMANOVA)
VIF                     Get Maximum Variance Inflation Factor (VIF)
                        from a Model
akaike_adjusted_rsq     Akaike-Adjusted R Squared Calculation with
                        Model Averaging
filter_vif              Filters out equations with high
                        multicollinearity
fit_models              Fit PERMANOVA models and arrange by AICc
make_models             Create models with different combinations of
                        variables
select_models           Select models based on AICc and VIF.
