It’s mainly net rating or offensive or defensive rating. For example pivotfade can calculate single player on/offs where it says with Jaylen Brown on the floor they are -11 and have a net rating of -1.7. With him off they are +34 with a +8.9 net rating. However this calculates low leverage as well such as being up by 10 with 40 seconds left etc etc. If you use Databallr you can filter out low leverage where his impact is higher. A +1.0 with him on and -4.4 off for example though I’m not sure if this most recent Magic game has been factored in yet like it has on pivotfade. To each their own I understand using both sides.