Head-to-Head Weighting Calculator

Set the event before calculating

The headline Head-to-head adjusted probability is determined directly by Baseline win probability and Head-to-head wins; the remaining fields supply the comparison or adjustment required for Head-to-Head Weighting.

Market context

For this market, fitness news or a surface change can make otherwise recent averages poor inputs.

Treat tennis game handicap as a follow-up handled by Tennis Game Handicap; only compare the outputs when both describe the same event snapshot.

• At this stage, choose the least certain field and run one adverse case with other entries fixed.
• For this comparison, keep the new answer beside the baseline.
• As a practical check, a format, roster, participant, or settlement change calls for a new baseline.

Match every field to one event

• For the selected event, check the timestamp and unit for Baseline win probability because it supplies probability from the main model.
• Head-to-head wins belongs to the same period as the other entries. It is selected player wins in the matchup.
• Keep Head-to-head losses on the event basis defined here: selected player losses.
• Head-to-head weight is a separate input defined as share assigned to matchup history.

In this model, confirm that the baseline and adjustment did not both come from the same news.

Meaning of the displayed number

As a practical check, the answer is most useful as a baseline that can be updated.

For this market, follow the arithmetic once, then replace every figure with a sourced value.

For the Head-to-Head Weighting Calculator, use the worked case as a reproducibility check before entering live market assumptions. None of its values should be copied automatically.

Applying the Head-to-Head Weighting rule: weighted probability blends baseline model with head-to-head win rate.

Fair odds is -175. Head-to-head win rate is 66.67%. Baseline model is 62.72%.

For this head-to-head adjusted probability example, when the worked result differs, verify the field values one by one rather than changing several assumptions together.

Practical limitations

• Small or outdated head-to-head samples should receive limited weight.
• At this stage, review retirement, walkover, best-of format, tiebreak, and completed-set rules before comparing a price.
• For the saved case, correlation, selection bias, and small samples can remain when every field has a source.

Documenting a market snapshot

For this comparison, do not overwrite the old case during a one-field test.

The evidence behind this scenario

Check whether Baseline win probability and Head-to-head wins are independent pieces of information. If one was derived from the other, using both as separate adjustments may exaggerate the same signal. Keep the simpler case as a reference and document why any additional adjustment belongs in the calculation.

Questions raised by the calculation