TENNIS / Surface matchup context

Surface Specialization Spread

Compares the central 80% width and standard deviation of qualifying players' clay-minus-hard and grass-minus-overall win-rate differences.

Derived analysis4 published rows4 fieldsDate varies or is unrecorded; see scope

Published measurements

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MeasurementPopulationOrder

4 matching rows; 2 contain clay-hard p90-p10.

CSV includes 4 matching rows, all fields, and source context; missing values stay blank.

Measured rows: 2 / 42 unavailable
Median: 25.85 ppMiddle ranked value
Middle 50%: 24.26 pp to 27.44 pp25th to 75th percentile
Observed range: 22.66 pp to 29.04 ppMinimum to maximum

Summaries describe the filtered rows with equal row weight. Row counts are not independent game or event counts.

Measurement availability4 / 4 fields have values

Reference population: All published groups. 4 rows published.

Text search does not change this reference population.

Availability describes published values only. It does not establish data quality or independent game counts, and measurement windows can differ.

0 ppClay-hard P90-P1029.04 pp

Showing 2 of 2 matching numeric rows. Open a row to inspect all its fields. Rankings apply only to the published subset.

01 / Interpretation

What this measures

Wider distributions indicate more separation among qualifying players' historical surface profiles in that cohort.

02 / Calculation

central width = p90(surface win-rate difference) - p10(surface win-rate difference); SD = published cohort standard deviation

Use the table to inspect available fields and the source JSON to trace the formula inputs. CSV percentage values are stored as fractions.

03 / Population & limits

Published distribution summaries for four tour-window cohorts; WTA rows remain present with null metrics because no player cleared either floor.

These are distributions of historical player rates with unequal match counts, not paired predictions. Null means no qualifying distribution; it is not zero variation.

04 / Source & method references

Published source JSON ITF classified tennis surfaces

References explain ingredients and prior methods. They do not validate this derived analysis or establish its originality.