I want to interpret my regression output of my fixed effects model. I am looking at political interest and the independet variables I include are period and cohort. All terms I included are nonlinear, I included cohort as cubic in my model. My independent variables are standardised. (I will include a picture of my margins plot and regression table).

I have a question concering the interpretation the coefficients of my model. While my marginsplot shows me that my margins for cohort increase, my term for the linear effect is negative. How I understood it, it is convex, and as I understood it so far, my linear effect shows me my effect if x is 0? How do I then interpret the linear term or

do I not interpret it att all and only look at the margins? I there a way to transform the data so that the coeffients makes sense? What is the common way to do this?

(ok in the marginsplot is the variablename for cohort)

I am Thankful for any help!

Sarah