Probability error scorer
Test probability statements against outcomes rather than judging a model by its name.
Binary Brier score = mean((p − outcome)²). This is a binary scoring example, not a full multiclass race scoring implementation.
Enter your values, then
calculate or validate.
Use the result in context
Do not compare scores computed over different populations without explaining the difference.
No model is trained or advertised as profitable, and no live predictive service is supplied.
This tool processes your inputs in the browser. Notebook storage and downloads are explained in the privacy note.