I am working on my thesis (study) about poverty incidence rate and its socio-economic factors using second-order polynomial regression without interaction. The final model in my study is
PovertyIncidenceRate = 43.027 + .989(InflationRate) + .069(UnemploymentRate) - .442(CohortSurvivalRateinSecondarySchools) - .0000009(Population) - 0.035(InflationRate^2) + .138(UnemploymentRate^2) - .019(CohortSurvivalRateinSecondarySchools^2) - 0.0000000000001(Population^2)
How would i interpret these parameter estimates/coefficients (specifically the quadratic ones)? Please help me. Thank you and God bless you! :)