When we can make a better prediction of the outcome variable if we knew something about the explanatory variable; accounting for variation in the outcome variable by using variation in another variable.
Related Articles
Sampling Variation
Sampling variation is the natural tendency for different random samples from the same population or data generating process (DGP) to produce different results. Because each random sample contains different observations, sample statistics and model ...
outcome variable
Outcome variable is a variable whose variation we are trying to explain.
leftover variation
Leftover variation is variation in an outcome variable that remains after having accounted for variation due to at least one explanatory variable.
explanatory variable
Explanatory variable is a variable we use to explain variation in an outcome variable.
explained variation
Explained variation is the portion of the total variation we were able to attribute to a variable.