Closing line value, properly qualified
Why the closing price is a useful benchmark, why source consistency matters, and why CLV is not the same as profit.
What CLV tries to capture
Closing line value compares the price recorded at publication with a later price near market close. Consistently obtaining better prices than the close can be evidence that the decision process identifies information before it is fully reflected.
It remains a proxy. A positive closing-price comparison does not settle every question about model quality, limits, availability or transaction frictions.
A clean comparison needs rules
Market definition, line, bookmaker set and observation horizon must match. Switching sources after seeing the outcome turns an apparently precise metric into selection bias.
Coverage also matters. If closing prices exist for only the best-looking observations, the average is not representative.
How it should be published
A public CLV figure should sit beside its formula, source policy, closing-price coverage and cohort size.
- Same market and line.
- Fixed closing horizon.
- Named source policy.
- Missing observations included in coverage.
Sources
Direct links are preserved so the editorial reasoning can be checked independently.