Topic: Functional Forms for Covariates

Restricted Cubic Splines for Covariate Relationships

Saturable Emax Functions for Covariate Effects

Reference-Cell Coding for Nominal Covariates

Quadratic Covariate Effects and Turning Points

Power-Law Effects and Log-Ratio Interpretation

Piecewise Linear Covariate Effects with Prespecified Knots

Ordered Categories as Trend Effects

Log-Transforming a Continuous Covariate

Exponential Effects of Continuous Covariates

Effect Coding and Contrasts for Categorical Covariates