I have two equations with this format: $Ds= A+A^2+\alpha_1\tag{1}$ and $Ds= M+M^2+\alpha_2 \tag{2}$
Knowing that $(1)$ explains 72% of $Ds$ and $(2)$ 20%. I want to combine these two equations into one and know how much this equation explains. Something like:
$Ds= A+A^2+\alpha_1+M+M^2+\alpha_2$ (I know it cannot be a sum, but I don't know how to combine this).
Thank you for your answers.
SOSA
P.D: I don't have good notion in mathematics, and I'm not sure about the tag for this question.
Sorry for my bad explanation.
The facts are: I have two factors Age (A) and matrilineal link (M) I have a parameter the David score (Ds, hierarchy rank) I made a quadratic regression with the factor A, and I found that this regression explains 72% of Ds. I did the same thing with the factor M and I found that this regression explains 20% of Ds. So now I want to combine these two equations to explain the parameter Ds with these two factors.
Thank you again for your help
I have this idea: Ds=[(Ds= A+A^2+alpha1) + (Ds= M+M^2+alpha2)]/2
Is it correct? But How can I say how much they explain Ds?
SOSA