# Math Help - Logistics Regression: Odds Ratio for model with interactions

1. ## Logistics Regression: Odds Ratio for model with interactions

How do I find Odds Ratio for X2 for a model with interactions?

fitted model :

p = 1/ (1+exp {-0.377 + 0.0939*x1 - 0.464*X2 + 0.0308*X3 + 0.586*X1*X2+ 0.118*X2*X3 + 0.49*X1*X3 + 0.37*X1*X2*X3)

where beta0,1,2,3,4,5,6,7 are as follows respectively:
-0.377
0.0939
-0.464
0.0308
0.586
0.118
0.49
0.37

I understand that Odds Ratio |x2=1 / Odds Ratio |x2=0

and that the final result is :
= exp {beta2 + beta4*X1 + beta5*X3 +beta7*X1*X3}

for a model without interactions, i can just do exp {Beta2}
but for a model WITH interactions, how do i decide on what value to fix so that odds ratio for X2 can be compared ??

2. I have revised my equation (i took out interactions X1*X2*X3) :

p = 1/ (1+exp {-0.377 + 0.0933*x1 - 0.463*X2 + 0.0259*X3 + 0.585*X1*X2+ 0.112X2*X3 + 0.054*X1*X3)

and my final result is :

Odds Ratio for X2 : exp {Beta2 + Beta5*x3}

how do i work from here ?
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