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Interaction effect of education and ideology on concern about sea level rise. In statistics, an interaction may arise when considering the relationship among three or more variables, and describes a situation in which the effect of one causal variable on an outcome depends on the state of a second causal variable (that is, when effects of the two causes are not additive).
If the interaction effect A*B is still significant, we will be more confident in saying that there is indeed a moderation effect; however, if the interaction effect is no longer significant after adding the nonlinear term, we will be less certain about the existence of a moderation effect and the nonlinear model will be preferred because it is ...
The interaction information is represented by gray region, and it is the only one that can be negative. In probability theory and information theory , the interaction information is a generalization of the mutual information for more than two variables .
Interaction can be either direct or indirect. Interaction is direct, Hugo O. Engelmann explained, when participants exchange roles. It is indirect when roles cannot be exchanged. Face-to-face conversations, phone calls, and on-line chats are direct interactions. TV shows, radio programs, videos and books are forms of indirect interaction.
Simple mediation model. The independent variable causes the mediator variable; the mediator variable causes the dependent variable. In statistics, a mediation model seeks to identify and explain the mechanism or process that underlies an observed relationship between an independent variable and a dependent variable via the inclusion of a third hypothetical variable, known as a mediator ...
In statistics and causal graphs, a variable is a collider when it is causally influenced by two or more variables. The name "collider" reflects the fact that in graphical models, the arrow heads from variables that lead into the collider appear to "collide" on the node that is the collider. [1]
Interaction hypothesis, a theory of second language acquisition; Interaction (statistics), when three or more variables influence each other; Interactions of actors theory, created by cybernetician Gordon Pask; Fundamental interaction or fundamental force, the core interactions in physics; Human–computer interaction, interfaces for people ...
For example, the applied load (stress) on a mechanical part may vary. The measured strength of that part (tensile strength, etc.) may also be variable. The part will break when the stress exceeds the strength. [1] [2] With two normal distributions, the statistical interference may be calculated as above.