Dear Stata Listers,

Could one advise on how to claculate the marginal effect of one logged variable conditional on another logged variable? Model is as follows: ln(y)=b0+ b1ln(X1) + b2ln(X2) +b3ln(X3) + b5ln(X4) +b6ln(X3)##ln(X4) . The last term is an interaciton between ln(X3) and ln(X4). Any advice on how to calculate the marginal effect of X3 on y given X4 would be appreciated.

Thank you,
Julia