I posted a couple of months ago asking for help in regards to a study on how London Southend Airport has impacted local house prices.

I have completed the regressions but need some help understanding my results.

The variable of interest is the 'distance to the airport' and the model includes linear, quadratic and cubic terms;

lnsoldprice = -0.392*distance + 0.1246*distance^2 - 0.0111distance^3 + controls...

Can someone help me understand these results please?

Is the marginal effect of distance found by differentiating lnsoldprice with respect to distance?

Thank you - much appreciated!