How (or which) filter methods we can use to check if thete is no direct relationship between features and target

15 Views Asked by At

one approach of feature selection is filter method.

In this method we check 2 things:

  1. relation between feature i and target. we want to preserve only features that influence the target

  2. relation between feature i and feature j. we want to remove redundant features

There can be a situation where there is no direct relation between feature i to target, but there is relation between combination of 2 or more features to the target.

from my understanding, all the filter methods checks direct relationship (1 or 2) between feature i and target (and they don't check relation between multiple features to target)

  1. Am I right ?

  2. Are there any filter methods to check non-direct relation between features and target ? (or we must use wrapper or hybrid methods to select features when there is no direct relation ) ?