Marginsplot and interaction

[Rebecca Ivester]

Hi all--I am trying to use marginsplot to graph my interactions. I have got it to work successfully when I only have a linear interaction term, but I cannot figure out a way to use marginsplot to graph interactions once I include a squared term. Does anyone have advice?

Only a linear interaction term:

 eststo: areg `var' prop_same_gender c.prop_same_race##i.race_3_s              
                        
                margins race_3_s, dydx(prop_same_race)
                quietly margins race_3_s, at(prop_same_race=(0(.1)1))
                marginsplot, noci recast(line) ytitle("") title("`title'") legend(size(vsmall))

Regression with squared interaction term:

 eststo: areg `var' prop_same_gender c.prop_same_race##i.race_3_s c.prop_same_race_sq##i.race_3_s

[Scott Merryman]

Use factor variables to create squared variable and interactions with other variable:

sysuse auto,clear
reg price c.mpg##c.mpg##i.fore
qui margins fore, at(mpg=(10(1)40))
marginsplot

[Rebecca Ivester]

Brilliant! Thank you