Coefficient of Multiple Determination (R²)

The higher the R2 the better the model fits the data.

However, it is worth noting that more variables will result in a… penalty thing.

Negative R² values indicate a model with a very poor fit.

Reference:

https://www.statisticshowto.com/probability-and-statistics/coefficient-of-determination-r-squared/

https://www.britannica.com/science/coefficient-of-determination