Before revision: An econometric or statistical model may undergo a marginal gain when a new variable is admitted , and a marginal loss if  an existing variable is removed. The value of a variable to the model is quantified by its expected marginal gain and marginal loss .
After revision: An econometric or statistical model may undergo a marginal gain when a new variable is admitted , and a marginal loss if an existing variable from the model. We quantify the value of a variable to the model is quantified by its expected marginal gain and marginal loss .