When age alone is removed from the model, the significance level of the interaction variable drops from over 19% to substantially less than 1%. This is an example of colinearity: "Age" and ...

The interaction effects can be represented by a small tree: a regression trunk. This article proposes a new algorithm—Simultaneous Threshold Interaction Modeling Algorithm (STIMA)—to estimate a ...

The model was designed to examine various modes of inheritance (dominant and recessive), interaction type (1- or 2-way interaction) and risk/protective subgroups.