does stata have positive predictors of innovation what is the margin effect of innovation what is the value of innovation in statistics why is the average margin effect of the hhi positive why does the margins of innovation curve have negative values when predicting innovation, the margin value of the value is why is hhi predicting positive if it is squared how to use statistics margins what is the margin error in statistics what is the marginal effect for hhi in stata what is the marginal effect for innovation in stata how to predict an innovation model which hhi margins is negative why does the value of an innovation curve get negative? how to predict innovation in stata what is hhi what is the margin of innovation what is the average marginal effect of hhi what model has an estimated margin? what is the margin effect on innovation in stata chart