A typical predictive regression employs a multitude of potential regressors with various degrees of persistence while their signal strength in explaining the dependent variable is often low . Variable selection in such  context is of great importance.
<clarity> A typical predictive regression employs a multitude of potential regressors with various degrees of persistence while their signal strength in explaining the dependent variable is often low . Variable selection in such  context is of great importance.
Explanatory variables in a predictive regression typically exhibit low signal strength and various degrees of persistence while their signal strength in explaining the dependent variable is often low . Variable selection in such context is of great importance.