The calculator is based on a logistic regression model using team size and the presence or absence of each hero, villain, and environment as predictors.
There's currently no interaction term (accounting for how well heroes or villains do when paired with each other specifically. That might be a feature added later.
Click the lock icon or the quick select buttons to fix your selections in their current position (selected or unavailable for selection). Mouse over the results field (on mobile, just tap) for a summary of selected participants after hitting the Calculate button.
Report any bugs here!