# modelling a proportion dependent variable when two teams are involved

I am wondering what the best way to proceed in trying to predict the amount of possession a basketball team gets in a game. I have heard that beta regression tends to be good for proportions, but I am wondering how to go forward since I want the possession of both teams. Obviously possesion of one team will be 1 minus the possession of the other team, but will this always be the output of the regression model if it had the structure:

$$g(p) = x_i^T\beta$$

where $p$ is the possession of a single team.

• but im asking if there are any issues with this approach? Is it problematic if we have our response variables $y_1, y_2$ where there is a dependency $y_1 = 1-y_2$ Jul 12 '16 at 0:18