ELI5: Explain Like I'm 5

Backfitting algorithm

Imagine you are building a sandcastle on the beach. You add sand to make it bigger and shape it with your hands. But then, your friend comes and decides to add their own sand and shape it their own way. You might not like how their changes look, so you might change your sandcastle again to make it the way you want it.

This is sort of like how the backfitting algorithm works. It's a way to make changes to a prediction model to make it more accurate. The algorithm starts with an initial prediction model and then makes changes to it back and forth until it becomes more accurate. Just like how you change your sandcastle back and forth with your friend, the algorithm changes the model over and over again until it's the most accurate it can be. This process is called 'backfitting'.

The algorithm works by focusing on one part of the prediction model at a time, making small changes to that part until the entire model becomes better. It does this by looking at the data and finding patterns – just like how you look at the sandcastle and decide where to add more sand or shape it differently. Each time the algorithm makes a change, it checks to see how much better the model has become. By doing this many times over, the model should become very accurate at predicting outcomes.