How to find the marginal effect of interaction terms

[Huang Yingqian]

After evaluating the time invariant variables using the xtseqreg command (equation is ln(y)=b0+b1X1+b2(X1)^2+b3*X1*X2+other time variable), how do I find ∂y/∂X1 with the manual setting command? What is Stata's command to find the marginal effect and elasticity?

[Maarten Buis]

This is the subforum discussing Mata, the matrix language inside Stata. The correct place for your question is the General forum. Please repost your question there. Also clarify your question, as right now the title of your post is inconsistent with the body: you are asking about a marginal effect of x1 not the interaction effect. Also what marginal effect are you looking for: by allowing for non-linearity (quadratic) and the interaction effect there is no longer one marginal effect.

[Huang Yingqian]

Thank you so much

[Huang Yingqian]

This is the subforum discussing Mata, the matrix language inside Stata. The correct place for your question is the General forum. Please repost your question there. Also clarify your question, as right now the title of your post is inconsistent with the body: you are asking about a marginal effect of x1 not the interaction effect. Also what marginal effect are you looking for: by allowing for non-linearity (quadratic) and the interaction effect there is no longer one marginal effect.

Thank you so much