int_driver_isolation_stint_tyre

Driver isolation, tier 2’s stint layer: each stint’s pace line (slope of p on tyre age over its clean early/mid, non-recovery laps; NULL below var(‘isolation_min_stint_laps’) or with Sxx = 0, never NaN), the leave-driver-out peer slope (same race and compound, else the season pool), the car’s degradation character (int_constructor_deg_sensitivity), the tactical slope m_s and its SE, the cliff reference kappa_ref, and the per-season noise (sigma_w, rho1, f) every downstream SE uses.

Part of the Skill family.

Driver isolation, tier 2’s stint layer: each stint’s pace line (slope of p on tyre age over its clean early/mid, non-recovery laps; NULL below var(‘isolation_min_stint_laps’) or with Sxx = 0, never NaN), the leave-driver-out peer slope (same race and compound, else the season pool), the car’s degradation character (int_constructor_deg_sensitivity), the tactical slope m_s and its SE, the cliff reference kappa_ref, and the per-season noise (sigma_w, rho1, f) every downstream SE uses. Leakage: a function of the residual trajectory; no ML-contract mart may depend on it (T48, ml/tests/test_manifest_contract.py). WI-16a, _roadmap/_fixes/wi/WI-16-cumulative-driver-isolation.md.

Lineage

Overview

Property	Value
Layer	intermediate
Family	Skill
Contract enforced	No
Tags	driver_isolation
Upstream	int_driver_isolation_lap_pace

11 tests guard this model - 11 generic, 0 singular.

Columns

Column	Type	Nullable	Tests	Description
stint_id		Yes	not_null, unique	Stint identifier (int_stint_geometry.stint_id).
race_year		Yes	not_null	Season.
race_id		Yes	not_null	FastF1 event id, e.g. 2021_8.
driver_id		Yes	not_null	Driver (three-letter code). In the pair mart, the focal driver whose gains the row reports.
constructor_id		Yes	not_null	Constructor (stg_laps.constructor_id).
stint_number		Yes		Stint ordinal within the driver’s race (int_stint_geometry).
compound		Yes	not_null	Dry compound of the stint (INTERMEDIATE and WET laps are not in Ω).
era		Yes		Regulation era: pre<era_boundary> or post<era_boundary> (var era_boundary, 2022).
n_omega_laps		Yes	not_null	Ω laps in the stint.
n_pace_laps		Yes	not_null	Ω laps with p (a car term).
n_cliff_laps		Yes	not_null	Ω laps on a cliff tyre.
n_line_laps		Yes	not_null	Line laps the stint’s slope was fitted on (early/mid, not recovery, with p). Below var(‘isolation_min_stint_laps’) the slope and every tactical value are NULL.
line_mean_pace_gain_s		Yes		p_bar: mean p over the line laps, s/lap.
line_mean_age_laps		Yes		Mean tyre age over the line laps, laps.
line_ref_age_laps		Yes		age_ref: the tyre age of the stint’s first line lap, laps. Tactical accumulates from here (a declared attribution rule).
line_age_sxx		Yes		Sxx of tyre age over the line laps (REGR_SXX), laps^2.
line_slope_s_per_lap2		Yes		beta_s: REGR_SLOPE(p, age) over the stint’s line laps, s/lap per lap of age; > 0 = his isolated pace rises through the stint. NULL below the line floor or with Sxx = 0 (never NaN).
line_slope_se_s_per_lap2		Yes		OLS SE of the line slope, sigma_w / sqrt(Sxx f), s/lap^2.
season_sigma_w_s		Yes		Pooled within-stint SD of p around its stint line for the season, s.
season_rho1		Yes		Pooled lag-1 autocorrelation of those line residuals for the season (adjacent laps only).
season_neff_factor		Yes		f = (1 - rho+)/(1 + rho+), rho+ = GREATEST(season_rho1, 0): the effective-sample factor every SE uses. NULL if rho cannot be measured.