I'm working on gerrymandering. Both parties claim that the other party is better at it. My hypothesis is that some gerrymandered districts benefit the incumbe

I'm working on gerrymandering. Both parties claim that the other party is better at it. My hypothesis is that some gerrymandered districts benefit the incumbent to the point of actually benefiting the opposing party in the adjacent districts. So, the incumbent has a safe seat, but the net is a loss for his own party. I'd like to be able to demonstrate and quantify it.