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Covariation
When two variables change together in a systematic way.
Temporal precedence
The cause must happen before the effect.
Third-variable problem
A third variable may explain the relationship between two other variables.
Spurious association
An apparent relationship between two variables that is explained by another variable.
Moderation
When the relationship between two variables changes depending on a third variable.
Moderator variables
Variables that change the strength or direction of the relationship between two other variables.