________ is a linear model where the marginal effect of x_3 is negative or insignificant marginal effect in regression what is the marginal effect in a cross sectional regression? marginal effect of a model marginal effect with interaction is delta negative for cross sectional regression what kind of model would be used for the marginal effect marginal effect cross sectional regression with interactions what is the marginal effect of $x_3 in cross sectional regression analysis which condition is negative marginal effect what is marginal effect marginal effect in cross sectional regression what is the marginal effect for cross sectional regression what is the marginal effect of a model marginal effect model cross section marginal impact in cross sectional model what are the marginal effects of regression marginal effects in cross sectional regression marginal effect of beta when calculating the marginal effect of delta, what should the value be