Solution: Choosing Alpha with Validation

Exercise: Choosing Alpha with Validation

Solution

Try candidate alpha values inside cross-validation on the training set. Pick the best validation value, refit on training data, and evaluate once on the untouched test set.

Takeaways

• State the assumption that makes the method valid before trusting the result.
• Connect the computation back to the finance workflow, not only to the code.
• Check whether the result depends on average-case behaviour, validation design, or numerical safeguards.