Regressors

Why

We name a predictor whose codomain (its set of outputs) is the real numbers.

Definition

A regressor is a predictor whose codomain is the set of real numbers. Following this terminology, but speaking of processes, some¹ authors refer to the problem of constructing a regressor as regression or a regression problem.

1. Most, nearly all, universally. We do not use this because Bourbaki deals with mathematical objects, for which there is no concept of time. ↩︎