which statement is used for the reducing of covariates? when do you drop the highest order polynomials in c how to trim an interaction in model which statement is the best to trim a covariate in a model with a range what is the rule for reducing covariates why do i trim a model how to trim model with best cv why not to trim models which condition determines which model has the best variance-covariance structure what is the rule for dropping a polynomial what structure is used to rerun the model what is the highest order interaction in the vac formula? which rule to use for reducing covariates why do we need to discard higher order polynomials in models what rules are used for modeling if the interaction is bic, why does the model have to be dropped why does timecubic not be significant how to trim the model how to trim covariate model in phd what rules do you use when you trim an interaction?